Perhaps you should try some spelling variations:
trinh vat » trinh luat, sinh vat, trinh tai
trinh van » trinh quan, trinh toan, dinh van
trinh han » trinh quan
dung cong » dung trong
san chang » ban hang, dan chan, van khang
chang ban » hang ban, chang ran, chang nang
chi sach » chinh sach, chieu sach, co sach
cong san » cong tac
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - hanh ((trinh vat) or (((trinh van) OR (trinh han)))) dung cong san chang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - hanh ((trinh vat) OR (((trinh van) OR (trinh han)))) dung cong san chang ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi sach - hanh ((trinh vat) or (((trinh van) OR (trinh han)))) dung cong san chang ban".
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh ((trinh vat) or (((trinh van) OR (trinh han)))) dung cong san chang ban*.