Hello, I just started to learn Visual Force and I'm making Employee search and delete for my practice.

I started to make a search section first, which are Name, Birthday, and Email section however search results only works Name and Email.

How can I solve this issue?

This is my Page

<apex:page controller="EmployeeDelete2Controller">
    <apex:form >
        <apex:pageBlock title="EmployeeDelete">
            <apex:pageBlockSection columns="1">
                <apex:inputField required = "false" value="{!info.Employee_Name__c}"/>
                <apex:inputField required = "false" value="{!info.Employee_DOB__c}"/>
                <apex:inputField required = "false" value="{!info.Employee_Mailaddress__c}"/>  
            </apex:pageBlockSection>
            <apex:pageBlockButtons location="bottom">
                <apex:commandButton action="{!search}" value="Search"/>
            </apex:pageBlockButtons>
            <apex:pageBlockTable value="{!results}" var="in">
            	<apex:column value="{!in.Employee_Name__c}"/>
                <apex:column value="{!in.Employee_DOB__c}"/>
                <apex:column value="{!in.Employee_Mailaddress__c}"/>
            </apex:pageBlockTable>            
        </apex:pageBlock>
    </apex:form>
</apex:page>

This is my Controller
 

public class EmployeeDelete2Controller {
    public Employee_Management__c info { get;set; }
    
    public List<Employee_Management__c> results { get;set; }
    
    public EmployeeDelete2Controller(){
        results = new List<Employee_Management__c>();
        info = new Employee_Management__c();
    }
        
    public PageReference search(){
        String strSoqlQuery1;
        string strEmployeeNamec;
        
        String strSoqlQuery2;
        Date strEmployeeDOBc;
        
        String strSoqlQuery3;
        string strEmployeeMailaddressc;

        IF (!String.IsBlank(info.Employee_Name__c)) {
            strEmployeeNamec = info.Employee_Name__c;
            strSoqlQuery1 = 'SELECT Employee_Name__c, Employee_Mailaddress__c, Employee_DOB__c  FROM Employee_Management__c where Id != null and Employee_Name__c = \'' + strEmployeeNamec + '\'';
            results = database.query(strSoqlQuery1);
        }
                
        else if (!String.IsBlank(info.Employee_Mailaddress__c)) {
            strEmployeeMailaddressc = info.Employee_Mailaddress__c;
            strSoqlQuery3 = 'SELECT Employee_Name__c, Employee_Mailaddress__c, Employee_DOB__c  FROM Employee_Management__c where Id != null and Employee_Mailaddress__c = \'' + strEmployeeMailaddressc + '\'';
            results = database.query(strSoqlQuery3);
        }
        
        ELSE IF (info.Employee_DOB__c == null) {          
              Date myDate = date.newInstance(2020, 12, 7);
              strEmployeeDOBc = info.Employee_DOB__c;
              strSoqlQuery2 = 'SELECT Employee_Name__c, Employee_Mailaddress__c, Employee_DOB__c  FROM Employee_Management__c WHERE Employee_DOB__c <= '+ String.valueOf(myDate);
              results = database.query(strSoqlQuery2);

        }

           
        return null;
    }
}

I'm so sorry that my English skill is very poor.