Perhaps you should try some spelling variations:
chiet tach » chieu sach
trinh vat » trinh van, trinh luat, trinh han
hang cong » dang cong, hang nong, bang cong
ho chiet » ho chieu, ho thiet, hoc thiet
cong tan » cong tac, cong san, cong thanh
ban cau » bang cau, ban can, ban dau
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - hanh ((trinh vat) or (sinh vat)) hang cong tan ((ban cau) or (van cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((trinh vat) OR (sinh vat)) hang cong tan ((ban cau) OR (van cau)).
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((trinh vat) or (sinh vat)) hang cong tan ((ban cau) or (van cau))*.