Perhaps you should try some spelling variations:
duong quan » duong quang, duong qua, luong quan
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
hieu manh » hieu nganh, dieu hanh, hien hanh
dong quan » dong quang, dung quan, tong quan
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, 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: hoc ((chieu xanh) or (hieu manh)) - ha ((dong quan) or (duong quan)) nhung cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (hieu manh)) - ha ((dong quan) OR (duong quan)) nhung cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (hieu manh)) - ha ((dong quan) or (duong quan)) nhung cong dan toan ban*.