Perhaps you should try some spelling variations:
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
ho chieu » theo chieu, doi chieu, mot chieu
toan tap » toan 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: ((ho chieu) or (hoc thieu)) tinh - thanh tung va dung ((cong vang) OR (cong lang)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) tinh - thanh tung va dung ((cong vang) OR (cong lang)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) tinh - thanh tung va dung ((cong vang) OR (cong lang)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) tinh - thanh tung va dung ((cong vang) OR (cong lang)) toan tap*.