Perhaps you should try some spelling variations:
ban hang » ngan hang
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
ky tang » ky nang, ky dang, ky trong
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
ma hoi » mai hoi, xa hoi, ma hoa
cham o » cham soc
va cua » va chua, via cua, ca 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)) ma hoi. ((hieu ve) OR (hieu van)) cham o ban hang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky tang) OR (kho tang)) ma hoi. ((hieu ve) OR (hieu van)) cham o ban hang va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((ky tang) or (kho tang)) ma hoi. ((hieu ve) OR (hieu van)) cham o ban hang va cua tre*".