Perhaps you should try some spelling variations:
structured investment » structured environment, structured development, structure adjustment
2f developing » f developing, 7 developing, self developing
70 developing » 10 developing, 20 developing, 30 developing

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: %((structured investment) OR (structural adjustment)) %((economics public) OR (economic policy))%29 %((2f developing) OR (70 developing)) countries%22.
• Adding a wildcard symbol may retrieve word variants: %((structured investment) or (structural adjustment)) %((economics public) or (economic policy))%29 %((2f developing) or (70 developing)) countries%22*.