Perhaps you should try some spelling variations:
22historic buildings » historic buildings, _ historicbuildings, historical buildings
historic building » historic buildings, historical building, historical buildings
2f conservation » 2.1 conservation, 2.2 conservation, 2.7 conservation
20 conservation » 10 conservation, 2.1 conservation, 9 conservation
tobago island » tobago iceland, tobago ireland, tiago island
2f cape » 2 cape, 21 cape
h2f a » h2o a, hpf a, h2 a
2f a » 2fa a, e2f a, 2 a

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: %((22historic buildings) OR (historic building)) %((2f conservation) OR (20 conservation)) AND restoration %((2f cape) OR (off cape)) verde %((2f sa) OR (((2f a) OR (h2f a))))%cc%83o tobago island%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22historic buildings) or (historic building)) %((2f conservation) OR (20 conservation)) and restoration %((2f cape) or (off cape)) verde %((2f sa) or (((2f a) or (h2f a))))%cc%83o tobago island%22".
• Adding a wildcard symbol may retrieve word variants: %((22historic buildings) or (historic building)) %((2f conservation) OR (20 conservation)) and restoration %((2f cape) or (off cape)) verde %((2f sa) or (((2f a) or (h2f a))))%cc%83o tobago island%22*.