Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
nhung cong » dung cong, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
ho chieu » hoc thieu, doi chieu, mot chieu
cong san » cong tac
toan tai » doanh tai, toan ban, toan cao
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) OR (ho chieu)) sach - hanh tang va nhung cong san ((toan tai) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) sach - hanh tang va nhung cong san ((toan tai) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) sach - hanh tang va nhung cong san ((toan tai) or (toan tap))*.