Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
doan vai » doan va, doan van, doan hai
cay phoi » cap phoi, tay hoi, cay cho
vai cua » dai cua, hai cua, lai cua
va doan » va doanh, van doan, va dan
cach tu » cach thuc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, gay thoi
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet

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: thuat sach ky dang ((xay hoi) OR (cay phoi)). hieu ve ((cach tu) OR (cac du)) va doan vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky dang ((xay hoi) OR (cay phoi)). hieu ve ((cach tu) or (cac du)) va doan vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky dang ((xay hoi) OR (cay phoi)). hieu ve ((cach tu) or (cac du)) va doan vai cua tre*.