Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
danh vai » danh sai, danh va, doanh van
ban danh » ban doanh, ban hanh, ban dan
qua ban » cua ban, qua quan
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
van hoc » van hoa
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky lang) OR (ky dang)) van hoc. hieu va cau qua ban danh vai ((cuu tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky dang)) van hoc. hieu va cau qua ban danh vai ((cuu tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky dang)) van hoc. hieu va cau qua ban danh vai ((cuu tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky dang)) van hoc. hieu va cau qua ban danh vai ((cuu tre) or (su triet))*.