Perhaps you should try some spelling variations:
competition maternal » competition modern, competition moral, complications maternal
behavior dimensions » behavioral dimensions, behavioural dimensions, behavior diversion
maternal behavior » verbal behavior, thermal behavior
terrain data » brain data
brain using » basin using, brain aging

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

• Performing a fuzzy search may retrieve terms with similar spellings: competition maternal behavior dimensions ((terrain data) or (((terrain using) or (brain using))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: competition maternal behavior dimensions ((terrain data) OR (((terrain using) OR (brain using)))).
• Adding a wildcard symbol may retrieve word variants: competition maternal behavior dimensions ((terrain data) or (((terrain using) or (brain using))))*.