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
van khang » van khanh, van thanh, van quang
van hang » van hoang, van thang, ban hang
cong van » cong vang, cong san, song van
van quan » van ban
quan ha » quan he

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 ((van hang) OR (van khang)) cong van quan ha~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - hanh trinh ((van hang) OR (van khang)) cong van quan ha*".