Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
trung hoc » trung quoc
dung cong » dung trong
dan thanh » dang thanh, danh thanh, ban thanh
thanh lap » thanh san, phan lap, thanh hai
ho chieu » theo chieu, hoc thieu, mot chieu
cong dan » cong san, cong tan, huong dan

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 (ho chieu)) sach - thanh ((trung tam) or (trung hoc)) dung cong dan thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - thanh ((trung tam) OR (trung hoc)) dung cong dan thanh lap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) sach - thanh ((trung tam) or (trung hoc)) dung cong dan thanh lap*".