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
trang va » tran van, hang va
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 thieu tinh - canh trang va dung cong tan ((phan dau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - canh trang va dung cong tan ((phan dau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh trang va dung cong tan ((phan dau) OR (phan tu))*.