Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
truong cao » truong dai
hien tach » chiet tach, vien bach, hien hanh
trong cao » trong cac, trong ca, trong cay
dong cong » duong cong, dung cong, dang cong
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan cau » toan cau, van cau, tan ca

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: hoc ((hien tach) OR (thien hach)) - hanh ((trong cao) OR (truong cao)) dong cong van tan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) or (thien hach)) - hanh ((trong cao) OR (truong cao)) dong cong van tan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) or (thien hach)) - hanh ((trong cao) OR (truong cao)) dong cong van tan cau*.