Perhaps you should try some spelling variations:
dam planning » term planning, from planning, land planning
planning can » planning chain, planning case, planning land
china tan » china top, china two, china taiwan
yang minh » sang minh, yang mind, kang minah
congo can » congo call, cong van, congo a
tan yang » dan yang, tan ying, tan yong
cong tan » hong tan, cong van, cong sun

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 tan yang minh ((cong tan) OR (congo can)) ;~.
• Adding a wildcard symbol may retrieve word variants: dam planning can china tan yang minh ((cong tan) or (congo can)) ;*.