Perhaps you should try some spelling variations:
"agricultural sciences" » "agricultural science", "cultural sciences", "agricultural society"
"agriculture science" » "agricultural science", "agriculture evidence", "aquaculture science"
"agricultural prices" » "agricultural practices", "agricultural policies", "agricultural products"
"agriculture since" » "agriculture finance", "agriculture france", "agriculture sindhu"

Try widening your search to All Fields.

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 since"))) OR ((("agricultural sciences") OR ("agricultural prices")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"agriculture science\") or (\"agriculture since\"))) or (((\"agricultural sciences\") OR (\"agricultural prices\"))))".
• Removing quotes may allow a broader search: (((( agriculture science ) or ( agriculture since ))) or ((( agricultural sciences ) OR ( agricultural prices )))).
• Adding a wildcard symbol may retrieve word variants: (((("agriculture science") or ("agriculture since"))) or ((("agricultural sciences") OR ("agricultural prices"))))*.