Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
dong thanh » truong thanh
tranh van » tran van, trinh van, thanh van
nang dong » nang song, lang dong, nang luong
van nang » van quang, van ban, van dong
toan ban » van ban

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: theo chieu xanh - canh tranh van nang dong thanh ((toan cao) OR (((toan tap) OR (toan ban))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - canh tranh van nang dong thanh ((toan cao) or (((toan tap) OR (toan ban))))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - canh tranh van nang dong thanh ((toan cao) or (((toan tap) OR (toan ban))))*.