Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
cham duc » cham soc, pham duy, phan duc
kho tang » cao tang
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
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)) xa hoi. hieu ve ((cham duc) or (pham duc)) 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)) xa hoi. hieu ve ((cham duc) OR (pham duc)) 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)) xa hoi. hieu ve ((cham duc) or (pham duc)) ban thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) OR (kho tang)) xa hoi. hieu ve ((cham duc) or (pham duc)) ban thanh hai cua tre*.