Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong trong » cong thuong, duong trong, cong trinh
trong toan » truong toan, trong tan, trong hoan
hien xanh » hien hanh, hien nhanh, chieu xanh
hang cong » dang cong, hang nong, bang cong
toan cao » toan ban, toan tap
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - ((thanh trung) or (thanh tung)) va hang cong trong toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((thanh trung) OR (thanh tung)) va hang cong trong toan cao*.