Perhaps you should try some spelling variations:
land planning » based planning, road planning, dam planning
truong xuan » tung xuan
china tnps » china tips, china top, china trends
using tri » using triz, using triad, using trist
hong than » hong tan, long thanh, hong hai
using ti » using tik, using ai, using time

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 china china tnps ((using ti) OR (using tri)) ((truong xuan) OR (hong than)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "land planning china china tnps ((using ti) OR (using tri)) ((truong xuan) or (hong than)) ;~".
• Adding a wildcard symbol may retrieve word variants: land planning china china tnps ((using ti) OR (using tri)) ((truong xuan) or (hong than)) ;*.