Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
va cam » va cham, va cac, va cao
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky tang ((ma hoi) or (ma hoa)). hieu ((ve cam) OR (va cam)) duc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang ((ma hoi) OR (ma hoa)). hieu ((ve cam) OR (va cam)) duc ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang ((ma hoi) or (ma hoa)). hieu ((ve cam) OR (va cam)) duc ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang ((ma hoi) or (ma hoa)). hieu ((ve cam) OR (va cam)) duc ban thanh tai cua tre*.