Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
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: ((so sach) or (co sach)) ky lang xa hoi. hieu van cam ((xuc va) or (tuc xa)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky lang xa hoi. hieu van cam ((xuc va) OR (tuc xa)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ky lang xa hoi. hieu van cam ((xuc va) or (tuc xa)) hanh vi cua tre*.