Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
me hoi » le hoi
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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 ((me hoi) or (mai hoi)). hieu qua cham luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((me hoi) OR (mai hoi)). hieu qua cham luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((me hoi) or (mai hoi)). hieu qua cham luc va hanh vi cua tre*.