Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((ma hoi) or (mai khoi)). hieu ve cham ((duc ban) or (dua ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (mai khoi)). hieu ve cham ((duc ban) OR (dua ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (mai khoi)). hieu ve cham ((duc ban) or (dua ban)) hanh vi cua tre*.