Perhaps you should try some spelling variations:
planning guide » training guide
planning gain » planning chain, planning against, planning using
luong thanh » long thanh, truong thanh
using tik » using ti, using time, using task
hong than » hong tan, long thanh, hong hai
china ip » china i, china ii, china im
ip using » up using, ahp using, top using

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 gain) OR (planning guide)) china ip using tik ((luong thanh) OR (hong than)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "land ((planning gain) OR (planning guide)) china ip using tik ((luong thanh) or (hong than)) ;~".
• Adding a wildcard symbol may retrieve word variants: land ((planning gain) OR (planning guide)) china ip using tik ((luong thanh) or (hong than)) ;*.