Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
nghe nam » nghe lam, nghiep nam, nghe nano
nam danh » nam dinh, nam dan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
xa danh » va danh, dia danh, van danh
cuu tre » cua tre, cau tren, cau treo
he nam » ha nam

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 nang dai hoi. hieu ((he nam) or (nghe nam)) thu ((xa danh) OR (nam danh)) sai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang dai hoi. hieu ((he nam) OR (nghe nam)) thu ((xa danh) OR (nam danh)) sai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang dai hoi. hieu ((he nam) or (nghe nam)) thu ((xa danh) OR (nam danh)) sai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang dai hoi. hieu ((he nam) or (nghe nam)) thu ((xa danh) OR (nam danh)) sai cuu tre*.