Perhaps you should try some spelling variations:
thanh trung » thanh tung
luong toan » luong thanh, truong toan, luong tin
doi chieu » doi chi, ho chieu, mot chieu
dung cong » dung trong
luong tai » dung tai, luong va
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
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: ((doi chieu) or (doc hieu)) sach - thanh trung va dung cong ((luong toan) OR (luong tai)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - thanh trung va dung cong ((luong toan) OR (luong tai)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) sach - thanh trung va dung cong ((luong toan) OR (luong tai)) cao*".