Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
tung tuan » trung tuan, hung tuan, quang tuan
thanh cha » thanh ha, thanh nha, thanh phan
thanh cac » hanh cac, thanh bac, thanh ca
tuan han » tuan hoan, luan han, tran han
han tung » hanh tung, han tong, han ung
tung dan » dung dan, huong dan, trung dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) OR (kien sach)) - thanh tung tuan han tung dan ((thanh cha) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - thanh tung tuan han tung dan ((thanh cha) OR (thanh cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (kien sach)) - thanh tung tuan han tung dan ((thanh cha) or (thanh cac))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (kien sach)) - thanh tung tuan han tung dan ((thanh cha) or (thanh cac))*.