Perhaps you should try some spelling variations:
historic building » historic buildings, historical building, historical buildings
20 conservation » 2.1 conservation, 9 conservation, 8 conservation
10 conservation » 9 conservation
21 conservation » 2.1 conservation, 11 conservation, 1 conservation
tiago island » tobago island, two island, bioko island
2f cape » 2 cape, 21 cape
2f sa » 2f 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: %((_ historicbuildings) OR (historic building)) %((21 conservation) OR (((20 conservation) OR (10 conservation)))) AND restoration %((2f cape) OR (off cape)) verde %2f sa%cc%83o ((tiago island) OR (sado island))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_ historicbuildings) or (historic building)) %((21 conservation) or (((20 conservation) OR (10 conservation)))) and restoration %((2f cape) or (off cape)) verde %2f sa%cc%83o ((tiago island) or (sado island))%22".
• Adding a wildcard symbol may retrieve word variants: %((_ historicbuildings) or (historic building)) %((21 conservation) or (((20 conservation) OR (10 conservation)))) and restoration %((2f cape) or (off cape)) verde %2f sa%cc%83o ((tiago island) or (sado island))%22*.