Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu cach » hieu cac, chieu sach, hieu ca
cua thong » cua thuong, cua khong, cua tong
thong tan » thong than, thong tran, thong tin
hoc hieu » hoc thieu, hoc hien, doc hieu
tan toan » tan tran, tap toan, van 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 hieu cach - ((thanh trung) or (canh tranh)) cua thong thong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((thanh trung) OR (canh tranh)) cua thong thong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((thanh trung) or (canh tranh)) cua thong thong tan toan cao*.