Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements free » requirements from, requirements fuel, requirements freebsd
free decision » fate decision, file decision, pre decision
based openg » based openmp
based open » based one, based oxygen

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 free decision ((based openg) or (((based open) or (based opengl))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements free decision ((based openg) OR (((based open) OR (based opengl)))).
• Adding a wildcard symbol may retrieve word variants: irrigation requirements free decision ((based openg) or (((based open) or (based opengl))))*.