Perhaps you should try some spelling variations:
communication cohesion » communication collections, communication control, communication cost
basics dimensions » basic dimensions, physics dimensions, basics extensions
based dimensions » based dimension, basic dimensions, based dimensioning
age levels » wage levels, safe levels, rate levels
age level » page level, wage levels, image level

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication cohesion ((basics dimensions) or (based dimensions)) ((age level) OR (age levels))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication cohesion ((basics dimensions) OR (based dimensions)) ((age level) OR (age levels)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication cohesion ((basics dimensions) or (based dimensions)) ((age level) OR (age levels))".
• Adding a wildcard symbol may retrieve word variants: communication cohesion ((basics dimensions) or (based dimensions)) ((age level) OR (age levels))*.