Sometimes you have to be creative with the query in order to get the results you want. If it doesn’t work the first time, don’t write the program off – experiment!
I just tried a search on ipad recipe app with a secondary query of sync or synch or synchronize and got 14 good results.
Be sure to read through the manual about how to construct queries. Also, a good strategy is to use a pretty general primary query, and then filter your results using the secondary query. Also, the “secondary search” field (the field at the top, not sure what to call it) allows you to filter queries on the fly without having to do the whole search again.