Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
dong thanh » truong thanh
canh tinh » hanh tinh, manh tinh, canh tranh
nang dong » nang song, lang dong, nang luong
ho chieu » hoc thieu, doi chieu, mot chieu
tinh van » trinh van, dinh van, tinh va
van nang » van quang, van ban, van dong
toan cao » toan ban
toan tap » toan 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) OR (ho chieu)) xanh - canh tinh van nang dong thanh ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) xanh - canh tinh van nang dong thanh ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) xanh - canh tinh van nang dong thanh ((toan cao) or (toan tap))*.