Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, dam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
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 khanh)) ky nang x ho. hieu va ((cam tuc) OR (nam thuc)) va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khanh)) ky nang x ho. hieu va ((cam tuc) OR (nam thuc)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khanh)) ky nang x ho. hieu va ((cam tuc) OR (nam thuc)) va hanh vi cua tre*.