Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements based » requirements a
based decision » based design
daniel silver » daniel sir, daniel scher
david steven » davis steven
david river » david rimmer, david ruiter, david silver

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 based decision ((david river) or (((david steven) or (daniel silver))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements based decision ((david river) OR (((david steven) OR (daniel silver)))).
• Adding a wildcard symbol may retrieve word variants: irrigation requirements based decision ((david river) or (((david steven) or (daniel silver))))*.