Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
dinh doi » dinh moi, tinh doi, dinh toi
tu cach » tu cac
tang xa » trang xa, tang ma, lang xa
van cam » van nam, van lam, van cau
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) kho tang xa hoi. hieu van cam ((xuc va) or (duc va)) dinh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) kho tang xa hoi. hieu van cam ((xuc va) OR (duc va)) dinh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) kho tang xa hoi. hieu van cam ((xuc va) or (duc va)) dinh doi cua tre*.