Perhaps you should try some spelling variations:
ngang thanh » nganh thanh, ngan thanh, nhanh thanh
thanh tung » thanh cong
nang thanh » dang thanh, tang thanh, nhanh thanh
doi chieu » doc hieu, doi chi, mot chieu
tung luan » dung luan, tang luan, tong luan
luan cong » luat cong, luong cong, luan chung
cong cong » cong dong, trong cong, dung cong
ho chieu » theo chieu, hoc thieu, mot chieu

You may be able to get more results by adjusting your search query.

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