Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
thanh tong » thanh cong, thanh tung, thanh long
quan nhung » qua nhung, cua nhung, luan chung
nhung cong » dung cong, thong cong, hang cong
quang than » quang thang, quang tuan, quang tran
hoc thieu » toc thieu, hoc hien
tong quan » thong quan, tong luan, luong quan
ho chieu » theo chieu, doi chieu, mot chieu

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)) sach - thanh tong quan nhung cong ((quang than) OR (quang thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) sach - thanh tong quan nhung cong ((quang than) OR (quang thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) sach - thanh tong quan nhung cong ((quang than) OR (quang thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) sach - thanh tong quan nhung cong ((quang than) OR (quang thanh)) cau*.