Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
dinh dai » dinh dat, sinh dai, dinh dao
tu cach » tu cac
tang xa » trang xa, tang ma, lang xa
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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 (thuat sach)) kho tang xa hoi. hieu van cam ((tuc va) or (duc va)) dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuat sach)) kho tang xa hoi. hieu van cam ((tuc va) OR (duc va)) dinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuat sach)) kho tang xa hoi. hieu van cam ((tuc va) or (duc va)) dinh dai cua tre*.