Perhaps you should try some spelling variations:
communication conversation » communication information, communication communication, communication foundation
communication cohesion » communication collections, communication control, communication cost
based excitation » base excitation, based elicitation, laser excitation
excitation from » elicitation from, excitation fronts, exportation from
from river » from liver, from rice

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication conversation) OR (communication cohesion)) based excitation from river~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((communication conversation) OR (communication cohesion)) based excitation from river".
• Adding a wildcard symbol may retrieve word variants: ((communication conversation) OR (communication cohesion)) based excitation from river*.