InfoPath: Query for multiple values in one query field

I have a form built in InfoPath 2010 that has multiple check box fields for querying with predetermined values. The problem I am running into though is that I cannot seem to query for multiple values.

Example:

I'd like to query for String 1 and String 2 against Field 1.

My understanding of SQL is that it would simply be written as:

WHERE Field_1 = 'String 1' OR Field_1 = 'String 2'

Is there a way to reproduce this in a query field?

I've tried S1 + S2, S1 %OR% S2, brackets, parens, single and double quotes. I must be missing something, right?

If you need any additional information, please let me know. Thanks in advance!

"Unfortunately, InfoPath doesn’t have that ability when querying data connections. You can set multiple query fields with one value, but you can’t set one query field with multiple values." --Clayton Cobb