Perhaps you should try some spelling variations:
cham luc » cham soc, cham cuu, chat lua
hang tai » hang va
hanh vai » hanh vi, hanh va, hanh tai
nhan luc » nang luc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
su cac » tu cac, su cao, su can

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: su cac ky ((hang tai) OR (dung tai)) roi. hieu ve ((cham luc) OR (nhan luc)) va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky ((hang tai) or (dung tai)) roi. hieu ve ((cham luc) OR (nhan luc)) va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su cac ky ((hang tai) or (dung tai)) roi. hieu ve ((cham luc) OR (nhan luc)) va hanh vai cua tre*.