Perhaps you should try some spelling variations:
"venezuela, republics bulgaria _" » "venezuela, republic bulgaria _"
"venezuela, public bulgaria _" » "venezuela, republic bulgaria _", "venezuela, policy bulgaria _", "venezuela, muslims bulgaria _"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"venezuela, republics bulgaria _\") OR (\"venezuela, public bulgaria _\"))".
• Removing quotes may allow a broader search: (( venezuela, republics bulgaria _ ) OR ( venezuela, public bulgaria _ )).
• Adding a wildcard symbol may retrieve word variants: (("venezuela, republics bulgaria _") OR ("venezuela, public bulgaria _"))*.