Perhaps you should try some spelling variations:
land planning » based planning, road planning, dam planning
case china » care china, catte china, use china
china yang » china ying, china wang, china chang
linh hoang » anh hoang
yang yang » wang yang, wang yan
tin hong » tan hong, kia hong, thi hong

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: land planning case china yang yang ((linh hoang) OR (tin hong)) than ;~.
• Adding a wildcard symbol may retrieve word variants: land planning case china yang yang ((linh hoang) or (tin hong)) than ;*.