Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
bien cac » vien cac, dien cac, bien ca
hieu cua » hieu qua, dieu cua, bieu cua
tung cua » trung cua, tuong cua, dung cua
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 ((bien cac) or (hieu cua)) - thanh tung cua nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((bien cac) OR (hieu cua)) - thanh tung cua nhung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((bien cac) or (hieu cua)) - thanh tung cua nhung cong san toan cao*.