If you have multiple workflows with same rules, i think somewhere your business logic is failing. But if the workflow rules are different, in that case they will excecute based on the rule.
when i've needed complete control over the order of execution of a workflow i've created a trigger. Salesforce does not guarantee the order of execution of workflows and there is no real way for an admin to influence the order except to resort to code.
If you have multiple workflows with same rules, i think somewhere your business logic is failing. But if the workflow rules are different, in that case they will excecute based on the rule.
So there won't be any conflict.