Perhaps you should try some spelling variations:
implementation quality » implementation reality, implementation quilt, implementation capacity
presentation quality » representational quality, prescription quality, presentation unit
commercial across » commercial crops, commercial actors, commercial crisis
across earth » across health, across east, across north
earth self » early self, earth sex, ehealth self

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial across earth self ((presentation quality) OR (implementation quality)) studies.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial across earth self ((presentation quality) OR (implementation quality)) studies.".
• Adding a wildcard symbol may retrieve word variants: commercial across earth self ((presentation quality) OR (implementation quality)) studies.*.