Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
anh dang » anh dong, anh bang, anh danh
anh dung » anh dong, anh huong, sach dung
van cong » van dong, van phong, phan cong
toan cao » toan ban
toan tap » toan ban
cua van » cua ban, cua vat, cua dan

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 - ((anh dang) OR (anh dung)) cua van cong trinh ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((anh dang) or (anh dung)) cua van cong trinh ((toan cao) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((anh dang) or (anh dung)) cua van cong trinh ((toan cao) OR (toan tap))*.