Perhaps you should try some spelling variations:
irrigation requirement » irrigation requirements, irrigation equipment, irrigation department
requirement patterns » requirements patterns, frequent patterns, settlement patterns
patterns definition » pattern definition, patterns definitional, patterns recognition
array formats » array format, assay formats, array formulas
array arcing » array forming, array probing, array sharing
array using » arrays 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 requirement patterns definition ((array arcing) or (((array using) or (array formats))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirement patterns definition ((array arcing) OR (((array using) OR (array formats)))).
• Adding a wildcard symbol may retrieve word variants: irrigation requirement patterns definition ((array arcing) or (((array using) or (array formats))))*.