Perhaps you should try some spelling variations:
ngang thanh » nang thanh, nganh thanh, ngan thanh
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, mot chieu
tung luan » dung luan, tang luan, tong luan
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
thanh cau » thanh chau, thanh mau, nhanh cau
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 ((dong cong) OR (dung cong)) ngang thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - thanh tung luan ((dong cong) OR (dung cong)) ngang thanh cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - thanh tung luan ((dong cong) OR (dung cong)) ngang thanh cau*.