Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
regression splinesar » regression linear, regression spines, regression nonlinear
regression splines » regression linear, regression applied, regression nonlinear
documentation a » documentation _, documentation fast
a dimensions » _ dimensions, 2 dimensions, 3 dimensions

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication documentation a dimensions ((regression splines) or (regression splinesar))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication documentation a dimensions ((regression splines) OR (regression splinesar)).
• Adding a wildcard symbol may retrieve word variants: communication documentation a dimensions ((regression splines) or (regression splinesar))*.