How to achieve this with helper. 
component:
<aura:component controller="AccountSearch" implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" >
    <!--button-->
    <aura:attribute name="searchkeyword" type="string" description="used to store user search"/>
    <aura:attribute name="TotalnoofRecords" type="integer" default="0" description="used to display the  no of records"/>
    <aura:attribute name="searchResult" type="List" description="used to store and display result"/>
    <aura:attribute name="message" type="boolean" description="used to  display message"/>
    <aura:attribute name="AccList" type="Account[]" />
    <aura:attribute name="columns" type="List"/>
    <!--aura:handler name="init" value="{!this}" action="{!c.fetchAccount}" /-->
    <lightning:button variant="brand" label="search" iconName="utility:search" onclick="{!c.Search}"/>
    <lightning:input value ="{!v.searchkeyword}"
                keyField="True"
                placeholder="search accounts.."
                label="AccountName"/>
      
    </aura:component>
controller:
({
     Search:function(component,event,helper) {
         helper.Searchhelper(component,event,helper);
     }
     })
Helper:
({
    SearchHelper : function(component,event) {
        
       component.set('v.columns', [
          {label:'AccountName', fieldName:'Name', type: 'text'},
          {label:'Type', fieldName:'Type', type: 'text'},
          {label:'Industry', fieldName:'Industry', type: 'text'},
          {label:'Phone', fieldName:'Phone', type: 'Phone'},
          {label:'Fax', fieldName:'Fax', type: 'text'}]);

           
        //Step1: Get the Apex method that should be invoked
        
         var action = component.get("c.fetchAccount");
         
       
         //step2: set the parameters
         action.setParams({ 
           'searchword':component.get("v.searchkeyword")
           
         });
        //Step4: handle the response from apex class method/Server side method
        action.setCallback(this, function(response){
            var storeResponse = response.getReturnValue();
            if (storeResponse.length==0){
                component.set("v.message",true);
            }
            else{
                component.set("v.message",false);
            }

           component.set("v.TotalnoofRecords",storeResponse.length);
            component.set("v.searchResult",storeResponse);
           
        });
        //Step3: Enqueue action/ApexMethod to be executed 
        $A.enqueueAction(action);
     

       
    }
})

Apex:
public class AccountSearch {
@AuraEnabled
    public static List<Account> fetchAccount(string searchword){
        string Searchkey = '%'+searchword+'%';
        List<Account> AccList = [select id,Name,Type,Industry,Phone,Fax from Account where Name=:Searchkey LIMIT 500];
        return AccList;
}
  
}