Perhaps you should try some spelling variations:
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
hanh tang » hanh trang, anh tang, hanh mang
theo yeu » theo tieu, thiet yeu, theo chu
va thong » va thuong, va phuong, he thong
tran tap » toan tap, tran tan, tran tuan
theo te » theo tu, theo tieu
tang va » trang va, tang van, thang va

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: ((theo te) OR (theo yeu)) sach - hanh tang va thong ((cong thanh) OR (dong thanh)) tran tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo te) or (theo yeu)) sach - hanh tang va thong ((cong thanh) OR (dong thanh)) tran tap~".
• Adding a wildcard symbol may retrieve word variants: ((theo te) or (theo yeu)) sach - hanh tang va thong ((cong thanh) OR (dong thanh)) tran tap*.