Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
basic dimensions » based dimension, pacific dimensions, design dimensions
concepts basic » concepts cases, concepts case
e rivera » m rivera, e ricerca
_ rivera » _ river, _ rivers, m rivera

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 basic dimensions ((e rivera) or (_ rivera))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication concepts basic dimensions ((e rivera) OR (_ rivera)).
• Adding a wildcard symbol may retrieve word variants: communication concepts basic dimensions ((e rivera) or (_ rivera))*.