Talvez debería tentar con algunhas variantes ortográficas:
communication operator » communication educator, communication over, communication conversation
basic dimensions » based dimension, pacific dimensions, design dimensions
operator basic » operators basic, operator based, operations basic
indexing tree » indexing time, indexing terms, indexing large
index tree » index free, index time, index stress

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication operator basic dimensions ((index tree) or (indexing tree))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication operator basic dimensions ((index tree) OR (indexing tree))*.