Perhaps you should try some spelling variations:
communication combustion » communication combination, communication composition, communication commission
dimensional regression » dimensional reduction, dimensional television, dimensional representation
communication control » communication concepts, communication culture, communication channel
physics dimensional » physics dimensions, physical dimensions, mechanics dimensional

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication combustion) or (communication control)) physics dimensional regression linear~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication combustion) OR (communication control)) physics dimensional regression linear.
• Adding a wildcard symbol may retrieve word variants: ((communication combustion) or (communication control)) physics dimensional regression linear*.