Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thien van » thi van
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » hieu va, lieu va, hieu ve
chat duc » chat xuc, chat doc, chet duoc
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang x)) hoi. ((hieu van) OR (thien van)) chat duc tan thanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. ((hieu van) OR (thien van)) chat duc tan thanh hoi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang x)) hoi. ((hieu van) OR (thien van)) chat duc tan thanh hoi cua tre*".