Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements vs » requirements v, requirements via, requirements _
vs dimensional » _ dimensional, 3 dimensional, 2 dimensional
array sharing » arrays bearing, array imaging, way sharing
array string » array strong, arrays strings, array forming
array arcing » array forming, array probing, array using

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