Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung thanh, trung tam, tran tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
tuan dang » tran dang, tuan bang, tuan dung
dang cong » dung cong
tac toan » tap toan, tam toan, hach toan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu manh) or (chieu sach)) - thanh trung tuan dang cong ((tac toan) or (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu sach)) - thanh trung tuan dang cong ((tac toan) OR (bai toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sach)) - thanh trung tuan dang cong ((tac toan) or (bai toan)) cau*.