Perhaps you should try some spelling variations:
historical building » historical buildings, historic buildings, historical thinking
20 conservation » 10 conservation, 2.1 conservation, 9 conservation
2f cape » off cape
21 cape » 11 cape, 21 cake, 21 cap
2 cape » 2 care
2f a » 2fa a, e2f a, h2f 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 (historical building)) %20 conservation AND restoration %((((((2f cape) OR (2 cape))) OR (21 cape))) OR (21 case)) verde %2f a%cc%83o (sado OR sardo) island%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((_ historicbuildings) or (historical building)) %20 conservation and restoration %((((((2f cape) or (2 cape))) or (21 cape))) or (21 case)) verde %2f a%cc%83o (sado OR sardo) island%22".
• Adding a wildcard symbol may retrieve word variants: %((_ historicbuildings) or (historical building)) %20 conservation and restoration %((((((2f cape) or (2 cape))) or (21 cape))) or (21 case)) verde %2f a%cc%83o (sado OR sardo) island%22*.