Perhaps you should try some spelling variations:
"sociocultural reproduction" » "cultural reproduction", "sociocultural evolution", "agricultural production"
"agricultural introduction" » "agriculture introduction", "agricultural production", "agricultural instruction"

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