Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
doan vai » doan va, doan van, doan hai
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, cay phoi
ky danh » ky anh
ky dang » ky nang
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 sac ((ky dang) OR (ky danh)) xay hoi. 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 sac ((ky dang) OR (ky danh)) xay hoi. hieu ve ((cach tu) or (cac du)) va doan vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sac ((ky dang) OR (ky danh)) xay hoi. hieu ve ((cach tu) or (cac du)) va doan vai cua tre*.