Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cong hoan » cong hoa, dong hoa, cong san
trung ca » trung cap, truong ca, trung can
hoan van » hoang van, hoa van, doan van
van cau » van dau, van hau, van chat

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: ho ((hieu manh) OR (chieu sach)) - thanh ((trung ca) OR (trung cua)) trong cong hoan van cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu sach)) - thanh ((trung ca) OR (trung cua)) trong cong hoan van cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sach)) - thanh ((trung ca) OR (trung cua)) trong cong hoan van cau*.