Perhaps you should try some spelling variations:
"international wider economic surveys" » "international water economic surveys", "international order economic surveys", "international video economic surveys", "international wider economic systems", "international modern economic surveys", "international higher economic surveys", "international war economic surveys"
"international rice economic studies" » "international price economic studies", "international prices economic studies", "international center economic studies", "international rice economic status", "international race economic studies", "international crime economic studies"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international rice economic studies") or ("international wider economic surveys"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international rice economic studies") OR ("international wider economic surveys")).
• Removing quotes may allow a broader search: (( international rice economic studies ) or ( international wider economic surveys )).
• Adding a wildcard symbol may retrieve word variants: (("international rice economic studies") or ("international wider economic surveys"))*.