Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
canh hang » tranh hang, cang thang, danh thang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
phan dau » hang dau
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 - canh hang va dung cong tan ((phan dau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - canh hang va dung cong tan ((phan dau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - canh hang va dung cong tan ((phan dau) or (phan tu))*.