Perhaps you should try some spelling variations:
international documentation » international cooperation, international communication, international convention
documentation intensive » documentation inventory, documentation indonesia
definition sources » definitions sources, definitive source, deposition sources
definition studies » deflection studies, deformation studies, inhibition studies

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

• Performing a fuzzy search may retrieve terms with similar spellings: international documentation intensive ((definition sources) OR (definition studies)) solar~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "international documentation intensive ((definition sources) OR (definition studies)) solar".
• Adding a wildcard symbol may retrieve word variants: international documentation intensive ((definition sources) OR (definition studies)) solar*.