Perhaps you should try some spelling variations:
2c institutions » 25 institutions, 2.3 institutions, 2.2 institutions
26 institutions » 2.6 institutions, 6 institutions, 16 institutions
c institutions » c institution, 8 institutions, 7 institutions

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: %22associations%((((2c institutions) OR (26 institutions))) OR (c institutions))%29 etc %_ bolivia%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22associations%((((2c institutions) OR (26 institutions))) or (c institutions))%29 etc %_ bolivia%22".
• Adding a wildcard symbol may retrieve word variants: %22associations%((((2c institutions) OR (26 institutions))) or (c institutions))%29 etc %_ bolivia%22*.