Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
mai hoi » mai khoi, dai hoi, lai hoi
luc van » luoc van, luu van, duc van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » ma hoa, me hoi, va hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((((ma hoi) or (xa hoi))) or (mai hoi)). hieu qua cham luc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((((ma hoi) OR (xa hoi))) OR (mai hoi)). hieu qua cham luc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((((ma hoi) or (xa hoi))) or (mai hoi)). hieu qua cham luc van hanh vai cua tre*.