Perhaps you should try some spelling variations:
2.1 conservation » 21 conservation, 11 conservation, 2.1 construction
21 cape » 21 case, 11 cape, 21 cap
21 cake » 21 case, 21 cases, 21 cable
2f sa » 2f a
historic » histories
historical » historiesal
sado » sardo, saldo, sao

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: %((historic buildings) OR (historical buildings)) %2.1 conservation AND restoration %((off cape) OR (((21 cape) OR (21 cake)))) verde %2f sa%cc%83o sado island%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((historic buildings) or (historical buildings)) %2.1 conservation and restoration %((off cape) or (((21 cape) OR (21 cake)))) verde %2f sa%cc%83o sado island%22".
• Adding a wildcard symbol may retrieve word variants: %((historic buildings) or (historical buildings)) %2.1 conservation and restoration %((off cape) or (((21 cape) OR (21 cake)))) verde %2f sa%cc%83o sado island%22*.