Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
kho tang » cao tang
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
sac kho » suc khoe, cac khoi, dac khoa
duc ban » duc tan, duc van, duc man
su sac » su sach, su cac, su xac
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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

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