Perhaps you should try some spelling variations:
thanh tung » thanh cong
dieu tinh » lieu tinh, dien tinh, kieu tinh
dung cong » dung trong
cong san » cong tac
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
tung va » trung va, tuong va, dung va
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: cao ((dieu tinh) OR (diep tinh)) - thanh tung va dung cong san ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cao ((dieu tinh) OR (diep tinh)) - thanh tung va dung cong san ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "cao ((dieu tinh) OR (diep tinh)) - thanh tung va dung cong san ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: cao ((dieu tinh) OR (diep tinh)) - thanh tung va dung cong san ((toan tai) or (toan ban))*.