Perhaps you should try some spelling variations:
thanh hang » thanh hoang, thanh thang, tranh hang
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
dung cong » dung trong
cong toan » cong tan, cong hoan, cong tuan
thuat cam » thuat dam, thuat chan, thuat xay
hoat cam » hoat nam, khoan cam, hoat chat
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: doc ((hieu tinh) or (kieu tinh)) - thanh hang va dung cong toan ((hoat cam) OR (thuat cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - thanh hang va dung cong toan ((hoat cam) OR (thuat cam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu tinh) or (kieu tinh)) - thanh hang va dung cong toan ((hoat cam) OR (thuat cam))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (kieu tinh)) - thanh hang va dung cong toan ((hoat cam) OR (thuat cam))*.