Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements first » requirements finish, requirements from, requirements free
first decision » first division, first revision, first session
based opengl » based open
based openg » based open, based openmp
nested » tested

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

• Performing a fuzzy search may retrieve terms with similar spellings: irrigation requirements first decision ((((based openg) OR (based opengl))) or (nested openmp))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements first decision ((((based openg) OR (based opengl))) OR (nested openmp)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "irrigation requirements first decision ((((based openg) OR (based opengl))) or (nested openmp))".
• Adding a wildcard symbol may retrieve word variants: irrigation requirements first decision ((((based openg) OR (based opengl))) or (nested openmp))*.