Perhaps you should try some spelling variations:
local poverty » global poverty, total poverty, rural poverty
heilman books » german books
robust end » robust read, robust bound
poverty a » poverty _, poverty data
robust e » robust _, robust a, robust l1
heitmannn » heitmann, heimann, neitmann
book » ebook
books » ebooks

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: (( local poverty a. heitmannn book ) OR ( a ((robust e) OR (robust end)). heilman books ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( local poverty a. heitmannn book ) or ( a ((robust e) OR (robust end)). heilman books ))~".
• Adding a wildcard symbol may retrieve word variants: (( local poverty a. heitmannn book ) or ( a ((robust e) OR (robust end)). heilman books ))*.