Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
ho chieu » hoc thieu, doi chieu, mot chieu
tang cua » mang cua, hang cua, thong cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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 chieu) OR (ho chieu)) sang - hanh ((tang cua) OR (tang luan)) nhung cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) sang - hanh ((tang cua) or (tang luan)) nhung cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) sang - hanh ((tang cua) or (tang luan)) nhung cong dan toan cau*.