Perhaps you should try some spelling variations:
kho tang » cao tang
ban hanh » ban hang
ky tang » ky nang, ky dang, ky trong
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
cham o » cham soc
vi cua » vai cua, di cua
o ban » co ban, lo ban, do ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ((ky tang) or (kho tang)) mai hoi. hieu ve cham o ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky tang) OR (kho tang)) mai hoi. hieu ve cham o ban hanh vi cua tre*.