Perhaps you should try some spelling variations:
dimensions impression » dimensions session, dimensional regression, dimension dimension
documentation basics » documentation based, documentation asia, documentation fast
documentation basic » documentation based, documentation asia, documentation fast
impression level » compression level, expression level, depression level

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

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