Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nam danh » nam dinh, nam dan
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
hieu he » hieu ve, hiem he, hieu le
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
sai va » mai va, dai va, hai va
he nam » ha nam, nghe 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 y nang ((ma hoi) or (xa hoi)). hieu he nam thu ((nam danh) or (va danh)) sai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (xa hoi)). hieu he nam thu ((nam danh) OR (va danh)) sai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (xa hoi)). hieu he nam thu ((nam danh) or (va danh)) sai va triet*.