Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
requirements patterns » requirement patterns, requirements water, requirements chapter
functions euler » functions error, functions ecole, functions egfr
functions e.l » functions esf, functions ecole, functions egfr

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 patterns ((functions e) or (((functions euler) OR (functions e.l)))) lines~.
• If you are trying to use Boolean operators, they must be ALL CAPS: irrigation requirements patterns ((functions e) OR (((functions euler) OR (functions e.l)))) lines.
• The words AND, OR and NOT may confuse the search; try adding quotes: "irrigation requirements patterns ((functions e) or (((functions euler) OR (functions e.l)))) lines".
• Adding a wildcard symbol may retrieve word variants: irrigation requirements patterns ((functions e) or (((functions euler) OR (functions e.l)))) lines*.