Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh hang » trinh han, tranh hang, trinh hanh
hang thong » hang thuong, hang khong, mang thong
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh trinh hang thong cong ((dan toan) or (van ban)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh trinh hang thong cong ((dan toan) OR (van ban)) ban*.