Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » thong cong, hang cong, nhung don
thuc thanh » thuoc thanh, thuc hanh, phuc thanh
thanh chau » thanh cha, thanh cham, thanh chu
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong

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) OR (dung cong)) thuc 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) OR (dung cong)) thuc 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) OR (dung cong)) thuc thanh chau".
• Adding a wildcard symbol may retrieve word variants: ho ((dieu hanh) or (chieu sach)) - thanh trung cua ((nhung cong) OR (dung cong)) thuc thanh chau*.