Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
nhu phuong » thu phuong, nhung phuong, thi phuong
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung tuan, trung cap
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 ((hieu cach) or (thien hach)) - thanh trung cua ((nhung cong) or (nhu phuong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (thien hach)) - thanh trung cua ((nhung cong) OR (nhu phuong)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (thien hach)) - thanh trung cua ((nhung cong) or (nhu phuong)) van toan cao*.