Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
simulation environments » simulation environment, population environment, population environmental
dimensions code » dimensions model, dimension codes, dimensions body
a dimensions » _ dimensions, 2 dimensions, 3 dimensions
code fish » cod fish, code five

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) or (simulation environments)) a dimensions code fish~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((irrigation requirements) OR (simulation environments)) a dimensions code fish.
• Adding a wildcard symbol may retrieve word variants: ((irrigation requirements) or (simulation environments)) a dimensions code fish*.