If you are using server filtering (along with read method of the datasource), you should apply the needed logic at server-side. In the action, you can control the dataset, that needs to be returned.
On the other hand, if you use the client filtering - you can subscribe for the filtering event of the widget and modify the result set at each filtering. For example, please consider the below implementation:
inputValue = e.sender.input.val();
e.preventDefault(); //prevents the default execution of the event
, value: inputValue }, // add the filter against the 1st field
, value: inputValue },// add the filter against the 2nd field
.dataSource.filter(); // clear filtering if all charachters are deleted
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