Perhaps you should try some spelling variations:
"japan korea's relationship" » "japan korean relationship", "japan korea's relations", "japan china's relationship"
"japan logan relationship" » "japan woman relationship", "japan woman relationships", "japan human relationship", "jason logan relationship", "japan logic relationship"
"japan foreign relations" » "japanese foreign relations", "iran foreign relations", "asean foreign relations"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("japan foreign relations") or ((("japan korea's relationship") or ("japan logan relationship"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("japan foreign relations") OR ((("japan korea's relationship") OR ("japan logan relationship")))).
• Removing quotes may allow a broader search: (( japan foreign relations ) or ((( japan korea's relationship ) or ( japan logan relationship )))).
• Adding a wildcard symbol may retrieve word variants: (("japan foreign relations") or ((("japan korea's relationship") or ("japan logan relationship"))))*.