Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cua » truong cua, trung tuan, trung cap
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien hach - thanh ((trung cua) or (truong cao)) nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh ((trung cua) OR (truong cao)) nhung cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh ((trung cua) or (truong cao)) nhung cong van toan cao*.