Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements a » requirements _
array imaging » arrays imaging, airway imaging, ray imaging
array string » array strong, array sharing, array forming
a dimension » _ dimension, new dimension

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 a dimension ((((array string) OR (arrays strings))) or (array imaging))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements a dimension ((((array string) OR (arrays strings))) OR (array imaging)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "irrigation requirements a dimension ((((array string) OR (arrays strings))) or (array imaging))".
• Adding a wildcard symbol may retrieve word variants: irrigation requirements a dimension ((((array string) OR (arrays strings))) or (array imaging))*.