Perhaps you should try some spelling variations:
comment dimension » community dimension, content dimensions, component dimensions
circuits comment » circuits current, circuits concept, circuits elements
scale spaces » scale space, sample spaces, tuple spaces
type spaces » state spaces
use spaces » tuple spaces, phase spaces, gauge 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 circuits comment dimension ((type spaces) or (((use spaces) or (scale spaces))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication circuits comment dimension ((type spaces) OR (((use spaces) OR (scale spaces)))).
• Adding a wildcard symbol may retrieve word variants: communication circuits comment dimension ((type spaces) or (((use spaces) or (scale spaces))))*.