Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
x hoi » o hoi, x ho, 5 hoi

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 v nang ((x hoi) OR (xa hoi)). hieu van cam xuc van thanh san ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((x hoi) OR (xa hoi)). hieu van cam xuc van thanh san ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang ((x hoi) OR (xa hoi)). hieu van cam xuc van thanh san ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((x hoi) OR (xa hoi)). hieu van cam xuc van thanh san ((cua tre) or (cua viet))*.