Perhaps you should try some spelling variations:
mai khoi » mai khoa, cac khoi, dai khoa
tai khoa » da khoa, noi khoa
te sach » toc sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((xa hoi) OR (((mai khoi) OR (tai khoa)))). hieu va cam xuc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((xa hoi) or (((mai khoi) OR (tai khoa)))). hieu va cam xuc va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((xa hoi) or (((mai khoi) OR (tai khoa)))). hieu va cam xuc va hanh vi cua tre*.