Perhaps you should try some spelling variations:
nang doc » nang luc
vu sach » vu bach, su sach, vu khach
vu khac » vu kham, vu khanh, bui khac
doc loi » duc loi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
vi cua » vai cua, di cua

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

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