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 forming » array format, array fermi, array formats
array arcing » array probing, array sharing, array using
array along » arrays long, array paving, array strong

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 along) or (((array arcing) OR (array forming))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirement patterns definition ((array along) OR (((array arcing) OR (array forming)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "irrigation requirement patterns definition ((array along) or (((array arcing) OR (array forming))))".
• Adding a wildcard symbol may retrieve word variants: irrigation requirement patterns definition ((array along) or (((array arcing) OR (array forming))))*.