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, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hanh tang » hanh trang, anh tang, hanh mang
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tang va » trang va, tang van, thang va

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 tang va ((nhung cong) OR (thong cong)) tac ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh tang va ((nhung cong) OR (thong cong)) tac ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh tang va ((nhung cong) OR (thong cong)) tac ((toan cau) or (toan tap))*.