Talvez debería tentar con algunhas variantes ortográficas:
communication conversation » communication information, communication cohesion, communication communication
conversation based » conversion based, conversation basic, conversation made
active problems » practice problems, activity problems, lattice problems
problems lang » problems long, problems yang, problem lang
based active » based adaptive

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 based active problems lang~.
• Adding a wildcard symbol may retrieve word variants: communication conversation based active problems lang*.