Perhaps you should try some spelling variations:
22historic buildings » historic buildings, _ historicbuildings, historical buildings
historic building » historic buildings, historical building, historical buildings
20 conservation » 10 conservation, 2.1 conservation, 10 conservative
tiago island » tobago island, two island, bioko island
21 cape » 21 case, 11 cape, 21 cake
h2f a » h2o a, hpf a, h2 a
2f a » 2fa a, e2f a, 2 a

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: %((22historic buildings) OR (historic building)) %20 conservation AND restoration %((off cape) OR (21 cape)) verde %((((2f a) OR (h2f a))) OR (e((2f a) OR (h2f a))))%cc%83o ((tiago island) OR (sado island))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22historic buildings) or (historic building)) %20 conservation and restoration %((off cape) or (21 cape)) verde %((((2f a) OR (h2f a))) or (e((2f a) OR (h2f a))))%cc%83o ((tiago island) or (sado island))%22".
• Adding a wildcard symbol may retrieve word variants: %((22historic buildings) or (historic building)) %20 conservation and restoration %((off cape) or (21 cape)) verde %((((2f a) OR (h2f a))) or (e((2f a) OR (h2f a))))%cc%83o ((tiago island) or (sado island))%22*.