Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh hai » thanh phan, thanh hoa, thanh san
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
cua te » cua tu

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 xa hoi. hieu ve ((giao duc) or (pham duc)) van thanh hai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. hieu ve ((giao duc) OR (pham duc)) van thanh hai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu ve ((giao duc) or (pham duc)) van thanh hai ((cua tre) or (cua te))*.