Perhaps you should try some spelling variations:
22historic buildings » historic buildings, _ historicbuildings, historical buildings
historic building » historic buildings, historical building, historical buildings
2f conservation » 20 conservation, 2.1 conservation, 2.2 conservation
21 conservation » 2.1 conservation, 1 conservation, 9 conservation
11 conservation » 9 conservation
tiago island » tobago island, two island, bioko island
2f a » 2fa a, e2f a, h2f a
cape » case, care, came

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)) %((2f conservation) OR (((21 conservation) OR (11 conservation)))) AND restoration %off cape verde %((2f sa) OR (2f 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)) %((2f conservation) or (((21 conservation) OR (11 conservation)))) and restoration %off cape verde %((2f sa) or (2f a))%cc%83o ((tiago island) or (sado island))%22".
• Adding a wildcard symbol may retrieve word variants: %((22historic buildings) or (historic building)) %((2f conservation) or (((21 conservation) OR (11 conservation)))) and restoration %off cape verde %((2f sa) or (2f a))%cc%83o ((tiago island) or (sado island))%22*.