Perhaps you should try some spelling variations:
communications application » communications applications, communication application, communication applications
matrix multidimensional » metric multidimensional, metrics multidimensional, data multidimensional
application matrix » applications matrix, application material, application mark
code dspaces » code space, code slices, coded space
code dspace » code space, coded space

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

• Performing a fuzzy search may retrieve terms with similar spellings: communications application matrix multidimensional ((code dspace) or (code dspaces))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communications application matrix multidimensional ((code dspace) OR (code dspaces)).
• Adding a wildcard symbol may retrieve word variants: communications application matrix multidimensional ((code dspace) or (code dspaces))*.