Perhaps you should try some spelling variations:
22historical buildings » historical buildings, historic buildings, historic building
historical building » historical buildings, historic buildings, historical thinking
2.2 conservation » 22 conservation, 1.2 conservation, 10.2 conservation
2f conservation » 2.1 conservation, 2.7 conservation, 2.3 conservation
20 conservation » 10 conservation, 2.1 conservation, 9 conservation
bioko island » disko island, dokdo island, fogo island
2 cape » 2 care
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: %((22historical buildings) OR (historical building)) %((((2f conservation) OR (2.2 conservation))) OR (20 conservation)) AND restoration %2 cape verde %2f sa%cc%83o ((bioko island) OR (sado island))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22historical buildings) or (historical building)) %((((2f conservation) OR (2.2 conservation))) or (20 conservation)) and restoration %2 cape verde %2f sa%cc%83o ((bioko island) or (sado island))%22".
• Adding a wildcard symbol may retrieve word variants: %((22historical buildings) or (historical building)) %((((2f conservation) OR (2.2 conservation))) or (20 conservation)) and restoration %2 cape verde %2f sa%cc%83o ((bioko island) or (sado island))%22*.