Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements based » requirements a
based decision » based design
aid schema » a schema, dtd schema, based schema
drm schema » orm schema, from schema, dam scheme

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 based decision ((aid schema) or (((drm schema) or (drm scheme))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements based decision ((aid schema) OR (((drm schema) OR (drm scheme)))).
• Adding a wildcard symbol may retrieve word variants: irrigation requirements based decision ((aid schema) or (((drm schema) or (drm scheme))))*.