Talvez debería tentar con algunhas variantes ortográficas:
communication recreation » communication preservation, communications regulation, communication recognition
recreation safety » recreation areas, radiation safety, recreation fast
spaces » dspaces
dspaces » ddspaces
dddspaces » ddddspaces
space » dspace

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication recreation safety ((spaces or dspaces) or dddspaces) euclidean space~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication recreation safety ((spaces OR dspaces) OR dddspaces) euclidean space.
• Adding a wildcard symbol may retrieve word variants: communication recreation safety ((spaces or dspaces) or dddspaces) euclidean space*.