Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
regression splines » regression applied, regression nonlinear
basics dimensions » basic dimensions, physics dimensions, based dimensions
concepts basics » concepts basic, concepts tactics, concepts based

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "communication concepts basics dimensions ((regression linear) OR (regression splines))~".
• Adding a wildcard symbol may retrieve word variants: communication concepts basics dimensions ((regression linear) OR (regression splines))*.