Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh luan » trinh luan, trinh luat, doanh luan
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
than tap » toan tap, phan tap, than cap
han tap » han tai, toan tap, nhan tai

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 - hanh tranh luan ((nhung cong) OR (hang cong)) dan ((than tap) OR (han tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh tranh luan ((nhung cong) OR (hang cong)) dan ((than tap) or (han tap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh tranh luan ((nhung cong) OR (hang cong)) dan ((than tap) or (han tap))*.