Perhaps you should try some spelling variations:
oil reservoirs » oil reservoir, _ reservoirs, gas reservoirs
oil reserves » oil reservoir, gold reserves, oil resources
aid reserves » acid reserves, vii reserves, grain reserves
loan aid » loan card, loan act, loan a

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: (( loan ((oil reserves) OR (oil reservoirs)) ) OR ( loan aid reserves )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( loan ((oil reserves) OR (oil reservoirs)) ) or ( loan aid reserves ))".
• Adding a wildcard symbol may retrieve word variants: (( loan ((oil reserves) OR (oil reservoirs)) ) or ( loan aid reserves ))*.