Perhaps you should try some spelling variations:
communication conversion » communication conversation, communications convention, communication cohesion
conversion based » conversion del, conversion a, converter based
based dimension » based dispersion, basic dimensions, based extension
array arcing » array forming, array probing, array sharing
rake angle » rake angles, range angle, ray angle
arrays ang » arrays a

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication conversion based dimension ((((array arcing) or (rake angle))) or (arrays ang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication conversion based dimension ((((array arcing) OR (rake angle))) OR (arrays ang)).
• Adding a wildcard symbol may retrieve word variants: communication conversion based dimension ((((array arcing) or (rake angle))) or (arrays ang))*.