Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, chau tinh, kieu tinh
canh trang » canh tranh, hanh trang, banh trang
lieu tinh » trieu tinh, diep tinh, bien tinh
dung cong » dung trong
trang va » tran van, hang va
cong tac » cong ty
hang dau » hang va, hang tai
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 (lieu tinh)) - canh trang va dung cong tac ((hang dau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (lieu tinh)) - canh trang va dung cong tac ((hang dau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) OR (lieu tinh)) - canh trang va dung cong tac ((hang dau) or (phan tu))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) OR (lieu tinh)) - canh trang va dung cong tac ((hang dau) or (phan tu))*.