Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
tung cua » trung cua, tuong cua, dung cua
khau ap » khau tap, khau nhap, khau tai
khan ap » khan cap, han ap, khan dam

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 - thanh tung cua ((cong cong) OR (dung cong)) san ((khau ap) OR (khan ap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh tung cua ((cong cong) or (dung cong)) san ((khau ap) OR (khan ap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh tung cua ((cong cong) or (dung cong)) san ((khau ap) OR (khan ap))*.