Perhaps you should try some spelling variations:
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
nam duc » pham duc, nam thuc, nam buoc
van hoe » van hoc, van hieu, van hien
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
va anh » van anh, va danh, va hanh
anh va » hanh va
va cua » va chua, via cua, ca cua
te sac » te sach, te cac, te san

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 sac ky dang ((van hoe) OR (van hoa)). hieu van ((nam duc) OR (nam duoc)) va anh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang ((van hoe) OR (van hoa)). hieu van ((nam duc) or (nam duoc)) va anh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky dang ((van hoe) OR (van hoa)). hieu van ((nam duc) or (nam duoc)) va anh va cua tre*.