Perhaps you should try some spelling variations:
dam planning » term planning, from planning, land planning
planning can » planning chain, planning case, planning land
china top » china's top, china tips
china two » china's two
congo can » congo call, cong van, congo a
cong tan » hong tan, cong van, cong sun
minh » mind, ming, mine

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: dam planning can ((china top) OR (china two)) anh minh ((cong tan) OR (congo can)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dam planning can ((china top) OR (china two)) anh minh ((cong tan) or (congo can)) ;~".
• Adding a wildcard symbol may retrieve word variants: dam planning can ((china top) OR (china two)) anh minh ((cong tan) or (congo can)) ;*.