Perhaps you should try some spelling variations:
communication past » communication fast, communication part, communication east
past dimension » fast dimension, poset dimension, hat dimension
gauge spaces » large space, use spaces
safe spaces » state spaces, shape spaces, scale spaces
age spaces » image spaces, large spaces, range spaces

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication communication past dimension ((age spaces) or (((gauge spaces) or (safe spaces))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication communication past dimension ((age spaces) OR (((gauge spaces) OR (safe spaces)))).
• Adding a wildcard symbol may retrieve word variants: communication communication past dimension ((age spaces) or (((gauge spaces) or (safe spaces))))*.