Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
canh trang » canh tranh, hanh trang, banh trang
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
than phan » thanh phan, toan phan, thanh pham
trang va » tran van, hang va
tan phan » toan phan, van phan, tai phan
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 - canh trang va dung cong ((tan phan) OR (than phan)) dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - canh trang va dung cong ((tan phan) OR (than phan)) dau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh trang va dung cong ((tan phan) OR (than phan)) dau*.