Perhaps you should try some spelling variations:
theo chiet » theo chieu, thep thiet
chiet tach » chieu sach
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chiet tach - hanh ((trinh va) or (trinh vat)) hang ((cong tan) OR (cong tac)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chiet tach - hanh ((trinh va) OR (trinh vat)) hang ((cong tan) OR (cong tac)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chiet tach - hanh ((trinh va) or (trinh vat)) hang ((cong tan) OR (cong tac)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo chiet tach - hanh ((trinh va) or (trinh vat)) hang ((cong tan) OR (cong tac)) toan tap*.