Perhaps you should try some spelling variations:
20 conservation » 10 conservation, 2.1 conservation, 9 conservation
2f conservation » 2.1 conservation, 2.2 conservation, 2.7 conservation
story building » theory building, summary building
tobago island » tobago iceland, tobago ireland, tiago island
sao tobago » sao tiago
21 cape » 21 case, 11 cape, 21 cake
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: %((22((story building) OR (historic buildings))s) OR (((story building) OR (historic buildings)))) %((2f conservation) OR (20 conservation)) AND restoration %((off cape) OR (21 cape)) verde %2f sa%cc%sao tobago island%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22((story building) or (historic buildings))s) or (((story building) or (historic buildings)))) %((2f conservation) OR (20 conservation)) and restoration %((off cape) or (21 cape)) verde %2f sa%cc%sao tobago island%22".
• Adding a wildcard symbol may retrieve word variants: %((22((story building) or (historic buildings))s) or (((story building) or (historic buildings)))) %((2f conservation) OR (20 conservation)) and restoration %((off cape) or (21 cape)) verde %2f sa%cc%sao tobago island%22*.