Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
kho tang » cao tang
cham coc » cham soc, kham cuoc, chat co
van cham » van chat, van tham, va cham
hai cua » thai cua, dai cua, hoi cua
coc ban » co ban, cac ban, hoc ban
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ky tang » ky nang, ky trong, tay tang
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 (kho tang))) or (ky dang)) xa hoi. hieu van cham coc ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((((ky tang) OR (kho tang))) OR (ky dang)) xa hoi. hieu van cham coc ban thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((((ky tang) OR (kho tang))) or (ky dang)) xa hoi. hieu van cham coc ban thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((((ky tang) OR (kho tang))) or (ky dang)) xa hoi. hieu van cham coc ban thanh hai cua tre*.