Perhaps you should try some spelling variations:
2.3 institutional » 2.3 institutionell, 13 institutional, 3.3 institution
2.3 institutions » 13 institutions, 3.3 institution, 2.3 institutionell
25 institutions » 5 institutions, 15 institutions, 2005 institutions
c institutions » 8 institutions, 7 institutions, 9 institutions
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%((((((2((c institutions) OR (c institution))) OR (25 institutions))) OR (((2.3 institutions) OR (2.3 institutional))))) OR (((c institutions) OR (c institution))))%2c etc %_ bolivia%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22associations%((((((2((c institutions) OR (c institution))) or (25 institutions))) or (((2.3 institutions) or (2.3 institutional))))) or (((c institutions) OR (c institution))))%2c etc %_ bolivia%22".
• Adding a wildcard symbol may retrieve word variants: %22associations%((((((2((c institutions) OR (c institution))) or (25 institutions))) or (((2.3 institutions) or (2.3 institutional))))) or (((c institutions) OR (c institution))))%2c etc %_ bolivia%22*.