Perhaps you should try some spelling variations:
"venezuela, republica bolivariana _" » "venezuela, republic bolivia _", "venezuela, republic boliviaa _", "venezuela, republic bulgariaa _", "venezuela, republics bulgariaa _", "venezuela, republica bolivariana de", "venezuela, republica boliviana _"
"venezuela, republica bolivarian _" » "venezuela, republic bolivia _", "venezuela, republic bulgaria _", "venezuela, republics bulgaria _", "venezuela, republica bolivariana de", "venezuela, republica ovarian _", "venezuela, republica bolivia _"
"venezuela, republics bulgariaa _" » "venezuela, republics bulgaria _", "venezuela, republic bulgaria _", "venezuela, public bulgaria _"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("venezuela, republica bolivarian _") OR ((("venezuela, republica bolivariana _") OR ("venezuela, republics bulgariaa _")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"venezuela, republica bolivarian _\") or (((\"venezuela, republica bolivariana _\") OR (\"venezuela, republics bulgariaa _\"))))".
• Removing quotes may allow a broader search: (( venezuela, republica bolivarian _ ) or ((( venezuela, republica bolivariana _ ) OR ( venezuela, republics bulgariaa _ )))).
• Adding a wildcard symbol may retrieve word variants: (("venezuela, republica bolivarian _") or ((("venezuela, republica bolivariana _") OR ("venezuela, republics bulgariaa _"))))*.