Perhaps you should try some spelling variations:
"agricultural reproduction" » "agricultural production", "agricultural productions", "sociocultural reproduction"
"agricultural instruction" » "agriculture instruction", "agricultural institution", "agricultural reconstruction"

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: (("agricultural reproduction") OR ("agricultural instruction")).
• Removing quotes may allow a broader search: (( agricultural reproduction ) or ( agricultural instruction )).
• Adding a wildcard symbol may retrieve word variants: (("agricultural reproduction") or ("agricultural instruction"))*.