Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements based » requirements a
based revision » base revision, based precision, based decision
array planning » library planning, therapy planning
array probing » arrays probing, assay probing, array profiling
array string » array strong, arrays strings, array sharing

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

• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements based revision ((((array probing) OR (array string))) OR (array planning))~.
• Adding a wildcard symbol may retrieve word variants: irrigation requirements based revision ((((array probing) or (array string))) or (array planning))*.