Perhaps you should try some spelling variations:
"agriculture science" » "agricultural science", "agricultural sciences", "agriculture evidence"
"agriculture sindhu" » "agriculture india", "agriculture index", "agriculture using"
"agriculture since" » "agriculture finance", "agriculture france", "agriculture using"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("agriculture science") OR ((("agriculture sindhu") OR ("agriculture since")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"agriculture science\") or (((\"agriculture sindhu\") OR (\"agriculture since\"))))".
• Removing quotes may allow a broader search: (( agriculture science ) or ((( agriculture sindhu ) OR ( agriculture since )))).
• Adding a wildcard symbol may retrieve word variants: (("agriculture science") or ((("agriculture sindhu") OR ("agriculture since"))))*.