Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » thien van, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky tang xa hoi. ((hieu van) or (hieu va)) cac xuc ((ngan hang) or (van thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky tang xa hoi. ((hieu van) OR (hieu va)) cac xuc ((ngan hang) OR (van thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky tang xa hoi. ((hieu van) or (hieu va)) cac xuc ((ngan hang) or (van thanh)) vi cua tre*.