Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
basics extensions » basins extension, basic extension, based extensions
basic dimensions » based dimension, pacific dimensions, design dimensions
causes tree » causal tree, causes cures, causes bruce

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication documentation ((basics extensions) or (basic dimensions)) causes tree~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication documentation ((basics extensions) OR (basic dimensions)) causes tree.
• Adding a wildcard symbol may retrieve word variants: communication documentation ((basics extensions) or (basic dimensions)) causes tree*.