Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thanh » truong thanh
thanh tong » thanh cong, thanh tung, thanh long
hieu vach » hieu cach, chieu sach, hieu van
tong cong » trong cong, cong cong, dung cong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
hieu va » lieu va, hieu qua

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

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