Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh vai » thanh hai, thanh van, thanh tai
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang ro » nang co, nang ho, nang ra
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang x

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang o) or (nang ro)) hoi. hieu van cao duc tan thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang o) OR (nang ro)) hoi. hieu van cao duc tan thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang o) or (nang ro)) hoi. hieu van cao duc tan thanh vai cua tre*.