Perhaps you should try some spelling variations:
nang doc » nang luc
su sach » so sach, vu sach
vu khac » vu kham, vu khanh, bui khac
doc loi » duc loi
qua cua » quan cua, quang cua, qua quan
va danh » va dinh, va hanh, dia danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cua tu » cua tuc, cua su, cua cu
va dan » ca dan, va dao, 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: ((su sach) or (vu khac)) ky nang doc loi. hieu qua cua 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 khac)) ky nang doc loi. hieu qua cua tu ((va danh) OR (va dan)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khac)) ky nang doc loi. hieu qua cua tu ((va danh) or (va dan)) vai cua tre*.