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, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
cong san » cong tac
toan tai » doanh tai, toan cao, von tai
toan ban » van 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 san ((((toan tai) OR (toan ban))) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh tang va nhung cong san ((((toan tai) OR (toan ban))) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh tang va nhung cong san ((((toan tai) OR (toan ban))) or (toan tap))*.