Perhaps you should try some spelling variations:
communication convection » communication connection, communications convention, communication contention
convection basic » conversation basic, convection mass, consumption 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.

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