Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
manh trung » manh tung, thanh trung, manh hung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai 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 (((hieu lang) or (chinh sach)))) - manh trung va dung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (((hieu lang) OR (chinh sach)))) - manh trung va dung cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (((hieu lang) or (chinh sach)))) - manh trung va dung cong tap toan cau*.