Perhaps you should try some spelling variations:
"yale agrarian studies." » "yale migration studies.", "yale asian studies.", "yale american studies.", "male agrarian studies."
"sale agrarian studies." » "sale migration studies.", "sale asian studies.", "sale american studies.", "small agrarian studies.", "states agrarian studies."
"enable urban studies." » "viable urban studies.", "enabling urban studies.", "enhance urban studies."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("yale agrarian studies.") OR ("sale agrarian studies."))) or ("enable urban studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("yale agrarian studies.") OR ("sale agrarian studies."))) OR ("enable urban studies.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"yale agrarian studies.\") OR (\"sale agrarian studies.\"))) or (\"enable urban studies.\"))".
• Removing quotes may allow a broader search: (((( yale agrarian studies. ) OR ( sale agrarian studies. ))) or ( enable urban studies. )).
• Adding a wildcard symbol may retrieve word variants: (((("yale agrarian studies.") OR ("sale agrarian studies."))) or ("enable urban studies."))*.