Perhaps you should try some spelling variations:
nang doc » nang luc
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
doc loi » duc loi
vu kham » vu khanh
va dan » ca dan, va dao, va dau
qua ca » qua cac, qua cua, qua cai
ca tu » ca tru, cau tu, ca thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu kham)) ky nang doc loi. hieu qua ca tu ((va danh) or (va dan)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu kham)) ky nang doc loi. hieu qua ca tu ((va danh) OR (va dan)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu kham)) ky nang doc loi. hieu qua ca tu ((va danh) or (va dan)) vai cua tre*.