Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va danh, ban hanh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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 ((va hanh) OR (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khanh)) ky nang x ho. hieu va cam tuc ((va hanh) OR (va thanh)) 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 ((va hanh) OR (va thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khanh)) ky nang x ho. hieu va cam tuc ((va hanh) OR (va thanh)) vi cua tre*.