Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
cong thanh » dong thanh, cong trinh, truong thanh
trinh cua » tinh cua, trinh luat, trinh luan
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap

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 - hanh ((trinh cua) or (trinh quan)) dang ((cong tan) OR (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((trinh cua) OR (trinh quan)) dang ((cong tan) OR (cong thanh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((trinh cua) or (trinh quan)) dang ((cong tan) OR (cong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((trinh cua) or (trinh quan)) dang ((cong tan) OR (cong thanh)) toan cao*.