Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » manh cua
doanh cua » doanh luan
dung cong » dung trong
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chiet tach)) - canh ((tranh cua) or (doanh cua)) dung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chiet tach)) - canh ((tranh cua) OR (doanh cua)) dung cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chiet tach)) - canh ((tranh cua) or (doanh cua)) dung cong dan toan cao*.