Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trung » hanh trang, manh trung, danh trung
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu tinh) or (nhieu tang)) - ((hanh trung) OR (thanh trung)) va dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (nhieu tang)) - ((hanh trung) OR (thanh trung)) va dung cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (nhieu tang)) - ((hanh trung) OR (thanh trung)) va dung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (nhieu tang)) - ((hanh trung) OR (thanh trung)) va dung cong tac toan cau*.