Perhaps you should try some spelling variations:
introduction transection » introduction transaction, introduction translation, introduction transmission
introduction transition » introduction translation, introduction traditional, introduction definition
methods recursion » methods recursive, methods decision, method recursive
recursion array » recursion arrays
array formulas » area formulas, harrop formulas, array format

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: ((introduction transection) OR (introduction transition)) methods recursion array formulas~.
• Adding a wildcard symbol may retrieve word variants: ((introduction transection) or (introduction transition)) methods recursion array formulas*.