Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nam xuc » cam xuc, nam xua, nam thuc
xuc may » xuc hay, truc may, phuc may
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
co hoi » co hoc
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((((co hoi) or (co loi))) or (xa hoi)). hieu van nam xuc may tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((((co hoi) OR (co loi))) OR (xa hoi)). hieu van nam xuc may tinh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((((co hoi) or (co loi))) or (xa hoi)). hieu van nam xuc may tinh vi cua tre*.