Perhaps you should try some spelling variations:
2.3 institutional » 2.3 institutionell, 13 institutional, 3.3 institutionen
9.3 institutionen » 3.3 institutionen, 2.1 institutionen, 2.2 institutionen
2.3 institutions » 13 institutions, 2.3 institutionell, 2004 institutions
25 institutions » 5 institutions, 15 institutions, 2005 institutions
3.3 institution » 3.3 institutionen, 3.3 konstitution, 13 institutions
2c institutions » 26 institutions, 2.2 institutions, 2.6 institutions
c institutions » c institution, 8 institutions, 7 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%((((((2c institutions) OR (25 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%((((((2c institutions) or (25 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%((((((2c institutions) or (25 institutions))) or (((2.3 institutions) or (((((3.3 institution) OR (9.3 institutionen))) or (2.3 institutional))))))) or (c institutions))%2c etc %_ bolivia%22*.