Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
trinh vi » trinh va, trinh ve, trinh viet
tinh voi » trinh voi, tinh doi, binh voi
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
co hoi » co hoc, co loi

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 ky nang ((co hoi) or (xa hoi)). hieu van cam xuc va ((tinh voi) or (trinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((co hoi) OR (xa hoi)). hieu van cam xuc va ((tinh voi) OR (trinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((co hoi) or (xa hoi)). hieu van cam xuc va ((tinh voi) or (trinh vi)) cua tre*.