Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, nhung don
nhan dang » nhan dan, phan dang, tran dang
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, doi chieu
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
dang va » dang van, dang vat, hang 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: ho chieu sach - nhan dang va ((nhung cong) OR (hang cong)) tan ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - nhan dang va ((nhung cong) OR (hang cong)) tan ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - nhan dang va ((nhung cong) OR (hang cong)) tan ((toan cau) or (toan tap))*.