Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, thong cua
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (theo chieu)) sach - hanh ((tang cua) OR (tang luan)) nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chieu)) sach - hanh ((tang cua) OR (tang luan)) nhung cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (theo chieu)) sach - hanh ((tang cua) OR (tang luan)) nhung cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chieu)) sach - hanh ((tang cua) OR (tang luan)) nhung cong san toan ban*.