Perhaps you should try some spelling variations:
integration functions » integration functional, integrating functions, interactions functions
programming recursion » programming decision, programming session, programming decisions
programming function » programming functional, programming functionals, programme function
basic truth » basic struts, basic touch, music truth

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: integration functions ((programming function) OR (programming recursion)) basic truth~.
• Adding a wildcard symbol may retrieve word variants: integration functions ((programming function) or (programming recursion)) basic truth*.