Perhaps you should try some spelling variations:
2.6 institutions » 2.3 institutions, 2.2 institutions, 2.8 institutions
26 institutions » 16 institutions, 25 institutions, 2.3 institutions
c institutions » c institution, 8 institutions, 7 institutions

Try widening your search to All Fields.

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%((((26 institutions) OR (2.6 institutions))) OR (c institutions))%29 etc %_ bolivia%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22associations%((((26 institutions) OR (2.6 institutions))) or (c institutions))%29 etc %_ bolivia%22".
• Adding a wildcard symbol may retrieve word variants: %22associations%((((26 institutions) OR (2.6 institutions))) or (c institutions))%29 etc %_ bolivia%22*.