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
cau cua » cau qua, ca cua, cu cua
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
van hoc » van hoa
ky lang » ky dang, ky tang, tay lang
ve cau » ke cau, va cau, ve cac

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 nang)) van hoc. hieu ve cau cua 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 nang)) van hoc. hieu ve cau cua 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 nang)) van hoc. hieu ve cau cua ban danh vai ((cuu tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky nang)) van hoc. hieu ve cau cua ban danh vai ((cuu tre) or (su triet))*.