Perhaps you should try some spelling variations:
thanh trung » thanh tung
thuoc thanh » chuoc thanh, hoc thanh, thuoc khang
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
thuc thanh » thuc hanh, phuc thanh, thu thanh
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((dieu hanh) or (chieu sach)) - thanh trung cua nhung cong ((thuc thanh) OR (thuoc thanh)) chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((dieu hanh) OR (chieu sach)) - thanh trung cua nhung cong ((thuc thanh) OR (thuoc thanh)) chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((dieu hanh) or (chieu sach)) - thanh trung cua nhung cong ((thuc thanh) OR (thuoc thanh)) chau".
• Adding a wildcard symbol may retrieve word variants: ho ((dieu hanh) or (chieu sach)) - thanh trung cua nhung cong ((thuc thanh) OR (thuoc thanh)) chau*.