Perhaps you should try some spelling variations:
communication conversion » communication conversation, communications convention, communication cohesion
conversion basic » conversation basic, conversion based, convection basic
basic dimensions » based dimension, pacific dimensions, design dimensions
data matching » data machine, data searching, data mapping
data caching » data machine, data searching, data cache

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 basic dimensions ((data matching) or (data caching))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication conversion basic dimensions ((data matching) OR (data caching)).
• Adding a wildcard symbol may retrieve word variants: communication conversion basic dimensions ((data matching) or (data caching))*.