Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
cong san » cong tac
chanh tu » nhanh tu, thanh tu, chinh tu
hanh tu » anh tu, danh tu

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

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