Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
communication channel » communication channels, communication case, communication challenges
pattern dispersion » matter dispersion, water dispersion, scattering dispersion
dispersion chapter » diversion chapter, _ dispersionchapter, dispersionchapter 5
chapter layer » water layer

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication concepts) or (communication channel)) pattern dispersion chapter layer~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication concepts) OR (communication channel)) pattern dispersion chapter layer.
• Adding a wildcard symbol may retrieve word variants: ((communication concepts) or (communication channel)) pattern dispersion chapter layer*.