Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, lieu tinh
thien tinh » khien tinh, thien minh, tien tinh
canh trang » canh tranh, hanh trang, banh trang
dung cong » dung trong
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, 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 ((thieu tinh) or (thien tinh)) - canh trang va dung cong dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (thien tinh)) - canh trang va dung cong dan phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) or (thien tinh)) - canh trang va dung cong dan phan dau*.