Perhaps you should try some spelling variations:
2.3 institutions » 2.3 institutional, 13 institutions, 3.3 institution
28 institutions » 2.8 institutions, 18 institutions, 25 institutions
8 institutions » 1 institutions, 4 institutions, 5 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%((((28 institutions) OR (2.3 institutions))) OR (8 institutions))%2c etc %_ bolivia%22.
• Adding a wildcard symbol may retrieve word variants: %22associations%((((28 institutions) or (2.3 institutions))) or (8 institutions))%2c etc %_ bolivia%22*.