Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, cong tan
thanh than » thanh thanh, thanh thang, thanh toan
hieu cach » hieu cac, hieu ca, biet cach
tung tuan » trung tuan, hung tuan, quang tuan
tuan bang » tuan dang, tuan hoang, thuat bang
bang cong » dang cong, bang song, hang cong
than cau » toan cau, phan cau, than cap

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 sach) or (hieu cach)) - thanh tung tuan bang cong thanh than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu cach)) - thanh tung tuan bang cong thanh than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu cach)) - thanh tung tuan bang cong thanh than cau*.