Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
trinh cua » trinh luat, trinh quan, trinh luan
hang cong » dang cong, hang nong, bang cong
tinh cua » sinh cua, tinh chat, tranh cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 tieu) OR (doi chieu)) sach - hanh ((trinh cua) OR (tinh cua)) hang cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (doi chieu)) sach - hanh ((trinh cua) OR (tinh cua)) hang cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (doi chieu)) sach - hanh ((trinh cua) OR (tinh cua)) hang cong dan toan cao*.