Perhaps you should try some spelling variations:
"bulgaria language" » "bulgarian language", "bulgaria average"
"nigeria language" » "nigerian languages", "sumerian language", "media language"
"bulgare langue" » "bulgare langues"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("bulgaria language") OR ("nigeria language"))) OR ("bulgare langue")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"bulgaria language\") OR (\"nigeria language\"))) or (\"bulgare langue\"))".
• Removing quotes may allow a broader search: (((( bulgaria language ) OR ( nigeria language ))) or ( bulgare langue )).
• Adding a wildcard symbol may retrieve word variants: (((("bulgaria language") OR ("nigeria language"))) or ("bulgare langue"))*.