Perhaps you should try some spelling variations:
2005 institutions » 2004 institutions, 2000 institutions, 2008 institutions
2.3 institutions » 2.3 institutional, 13 institutions, 3.3 institution
26 institutions » 2.6 institutions, 6 institutions, 16 institutions
25 institutions » 15 institutions, 2.2 institutions, 25 institutional
5 institutions » 5 institutional, 5 institutionen, 5 institutionelle
8 institutions » 1 institutions, 4 institutions, 8 institutional
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 (2005 institutions))))) OR (2.3 institutions))) OR (((5 institutions) OR (8 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 (2005 institutions))))) or (2.3 institutions))) or (((5 institutions) or (8 institutions))))%2c etc %_ bolivia%22".
• Adding a wildcard symbol may retrieve word variants: %22associations%((((((26 institutions) or (((25 institutions) OR (2005 institutions))))) or (2.3 institutions))) or (((5 institutions) or (8 institutions))))%2c etc %_ bolivia%22*.