Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va vanh » va van, va hanh, va anh
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa

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: tu sac ky nang ((o hoi) OR (co hoi)). hieu va cham soc ((va vanh) OR (va danh)) dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((o hoi) or (co hoi)). hieu va cham soc ((va vanh) or (va danh)) dai cua tre*.