Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
lam cua » nam cua, lam chat
va danh » va dinh, va dan, va hanh
hoc sac » hoc sach, hoc cac, hoc mac
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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: hoc sac ky nang x hoi. ((hieu ve) OR (hieu van)) cham soc ((ban thanh) OR (va danh)) lam cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang x hoi. ((hieu ve) OR (hieu van)) cham soc ((ban thanh) or (va danh)) lam cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang x hoi. ((hieu ve) OR (hieu van)) cham soc ((ban thanh) or (va danh)) lam cua tre*.