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
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
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 cong) OR (bang cong)) van quan ha~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - hanh trinh van ((hang cong) OR (bang cong)) van quan ha*".