Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoi » thanh hoai, thanh hoa, thanh hai
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
ky tang » ky nang, kho tang, ky trong
hoi cua » hoi chuc
ky dang » ky nang, ky danh
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
su sac » su sach, su cac, su xac

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