Perhaps you should try some spelling variations:
thanh tung » thanh cong
thong cong » trong cong, thong thong, phong chong
hieu sach » chieu sach, hieu cach, dien sach
tong cong » trong cong, cong cong, dung cong
thanh cac » hanh cac, thanh bac, thanh ca
thanh bai » thanh hai, thanh tai, thanh oai
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua

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: doc hieu sach - thanh tung cua ((thong cong) OR (tong cong)) trinh ((thanh cac) OR (thanh bai))~.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh tung cua ((thong cong) or (tong cong)) trinh ((thanh cac) or (thanh bai))*.