Merge FetchXML

Hi All,

Is there any way to merge two or more different fetchXML with same no of columns(fields are different) but different conditions. 
Example : Below are the three different Fetch XMLs. 

FetchXML1 : Get credit card details
FetchXML2 : Get saving account details 
FetchXML3 : Get term deposit details. 

I am making a Service call using JavaScript(SOAP Request). Is there any way to union the fetchXMLs and make one service call to get the results at one shot.

Please suggest any alternative approach. 

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