Perhaps you should try some spelling variations:
2.3 institutions » 2.3 institutional, 13 institutions, 3.3 institution
26 institutions » 2.6 institutions, 6 institutions, 16 institutions
25 institutions » 5 institutions, 15 institutions, 2005 institutions
c institutions » c institution, 5 institutions, c institutional
8 institutions » 4 institutions, 5 institutions, 8 institutional
1 institutions » 2 institutions, 1 institutional, 1 institutionelle
2c etc » 29 etc, qc etc

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 (25 institutions))) OR (2.3 institutions))) OR (((c institutions) OR (((8 institutions) OR (1 institutions))))))%2c etc %_ bolivia%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22associations%((((((26 institutions) or (25 institutions))) or (2.3 institutions))) or (((c institutions) or (((8 institutions) OR (1 institutions))))))%2c etc %_ bolivia%22".
• Adding a wildcard symbol may retrieve word variants: %22associations%((((((26 institutions) or (25 institutions))) or (2.3 institutions))) or (((c institutions) or (((8 institutions) OR (1 institutions))))))%2c etc %_ bolivia%22*.