Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trung cap » truong cao
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban
han tap » han tai, nhan tai, nhan tao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - manh ((trung cap) OR (trung tam)) thuong cong tan ((toan tap) OR (han tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - manh ((trung cap) OR (trung tam)) thuong cong tan ((toan tap) or (han tap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - manh ((trung cap) OR (trung tam)) thuong cong tan ((toan tap) or (han tap))*.