Perhaps you should try some spelling variations:
"international bidders economic studies" » "international borders economic studies", "international rivers economic studies", "international waters economic studies", "international wider economic studies", "international hinder economic studies", "international modern economic studies", "international bidders economic status", "international bidders economic surveys"
"international policy economy series" » "international poverty economy series", "international prices economy series", "national policy economy series", "international policy economic series", "international policy autonomy series", "international poppy economy series"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("international bidders economic studies") or ("international policy economy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international bidders economic studies") OR ("international policy economy series")).
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• Adding a wildcard symbol may retrieve word variants: (("international bidders economic studies") or ("international policy economy series"))*.