Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cac tuc » cac tu, cac tac, cac nuoc
va danh » va dinh, va hanh, dia danh
cac toc » cac toi, cac nuoc, cac thoi
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
va cua » va chua, via cua, ca 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 y nang xa hoi. hieu van ((cac tuc) OR (cac toc)) ((va danh) OR (va dan)) va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu van ((cac tuc) or (cac toc)) ((va danh) OR (va dan)) va cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van ((cac tuc) or (cac toc)) ((va danh) OR (va dan)) va cua tre*.