Perhaps you should try some spelling variations:
managed resources » manager resource, managing resources, management resources
power resources » water resources
27 costs » 2.7 costs, 27 costas, 17 costs
23 costs » 2.3 costs, 3 costs, 13 costs
10 costs » 10 cost
2 costs » _ costs, 2 cost, 4 costs
1 costs » 12 costs, _ costs, 1 cost

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: %((power resources) OR (((unmanaged resources) OR (managed resources)))) %((((((27 costs) OR (23 costs))) OR (2 costs))) OR (((1 costs) OR (10 costs))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((power resources) or (((unmanaged resources) or (managed resources)))) %((((((27 costs) or (23 costs))) or (2 costs))) or (((1 costs) OR (10 costs))))%22".
• Adding a wildcard symbol may retrieve word variants: %((power resources) or (((unmanaged resources) or (managed resources)))) %((((((27 costs) or (23 costs))) or (2 costs))) or (((1 costs) OR (10 costs))))%22*.