Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tieu sach » chieu sach, dien sach, te sach
trinh qua » trinh quan, trinh cua, trinh quang
tong cong » trong cong, cong cong, dung cong
qua tong » qua trong, qua song, qua cong
san toan » van toan, dan toan, manh toan
van tuan » van quan, van ban, anh tuan
van tan » van ban, van tai, van thanh

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 tieu sach - hanh trinh qua tong cong ((((san toan) OR (van tan))) OR (van tuan)) cau~.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh trinh qua tong cong ((((san toan) or (van tan))) or (van tuan)) cau*.