Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
doi chiet » doi chieu, doi chi, doi viet
cong van » cong vang, cong san, song van
van quan » van ban
quan cau » quang cao, toan cau, quan ha
va lang » va nang, hoa lang
va ban » van ban, va bai, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh trinh ((va ban) or (va lang)) cong van quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh trinh ((va ban) OR (va lang)) cong van quan cau*.