Perhaps you should try some spelling variations:
cac thuc » cach thuc, can thuc, cay thuc
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
danh du » danh dau, danh tu, dinh du
va danh » va dinh, va dan, va hanh
cac thu » cach thuc, cac thoi
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
du cua » duy cua, dau cua, dum 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: ((su sach) OR (so sanh)) y nang xa hoi. hieu van ((cac thuc) OR (cac thu)) va danh du cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y nang xa hoi. hieu van ((cac thuc) OR (cac thu)) va danh du cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang xa hoi. hieu van ((cac thuc) OR (cac thu)) va danh du cua tre*.