Perhaps you should try some spelling variations:
2.3 institutional » 2.3 institutionell, 13 institutional, 3.3 institutionen
2005 institutions » 2004 institutions, 2000 institutions, 2008 institutions
9.3 institutionen » 3.3 institutionen, 2.1 institutionen, 2.2 institutionen
2.2 institutions » 2.2 institution, 3.2 institutions, 7.2 institutions
2.3 institutions » 13 institutions, 2.3 institutionell, 2004 institutions
3.3 institution » 3.3 institutionen, 3.3 konstitution, 13 institutions
25 institutions » 5 institutions, 15 institutions, 25 institutional
c institutions » c institution, 5 institutions, 8 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%((((((2.2 institutions) OR (((25 institutions) OR (2005 institutions))))) OR (((2.3 institutions) OR (((((3.3 institution) OR (9.3 institutionen))) OR (2.3 institutional))))))) OR (c institutions))%2c etc %_ bolivia%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22associations%((((((2.2 institutions) or (((25 institutions) or (2005 institutions))))) or (((2.3 institutions) or (((((3.3 institution) OR (9.3 institutionen))) or (2.3 institutional))))))) or (c institutions))%2c etc %_ bolivia%22".
• Adding a wildcard symbol may retrieve word variants: %22associations%((((((2.2 institutions) or (((25 institutions) or (2005 institutions))))) or (((2.3 institutions) or (((((3.3 institution) OR (9.3 institutionen))) or (2.3 institutional))))))) or (c institutions))%2c etc %_ bolivia%22*.