Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
trinh van » trinh han, trinh quan, trinh toan
van thong » van thuong, van phong, va thong
dan than » dan chan, ban than, van than
van tai » von tai, van tuan

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 van thong cong ((dan than) or (van tai)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh trinh van thong cong ((dan than) OR (van tai)) ban*.