Perhaps you should try some spelling variations:
land planning » based planning, road planning
dam planning » term planning, from planning, 2 planning
china tan » china top, china two, china taiwan
sang minh » kang minah, anh minh, song min
minh hong » minh cong, min hong, linh hoang
tan sang » tan yang, tang tang, tan hong

You may be able to get more results by adjusting your search query.

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