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