Perhaps you should try some spelling variations:
documentation basic » documentation basics, documentation asia, documentation fast
documentation based » documentation fast, documentation a, documentation center
extension aversion » extension torsion, extension region, extension division
aversion level » conversion level, session level

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 basic) OR (documentation based)) extension aversion level~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication ((documentation basic) OR (documentation based)) extension aversion level".
• Adding a wildcard symbol may retrieve word variants: communication ((documentation basic) OR (documentation based)) extension aversion level*.