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
trang va » tran van, hang va
cong tac » cong ty
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tang va » tang van, thang va, tang vat

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) OR (trang va)) nhung 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) OR (trang va)) nhung cong tac ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((tang va) OR (trang va)) nhung cong tac ((toan cau) or (toan tap))*.