Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh de » hanh de, thanh ve, thanh do
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cau luu » cau luc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
luu van » cuu van, luan van, luu hanh
de cua » le cua, te cua, dieu cua
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach ty)) nang xa hoi. ((hieu ve) OR (hieu van)) cau luu van thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) nang xa hoi. ((hieu ve) OR (hieu van)) cau luu van thanh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach ty)) nang xa hoi. ((hieu ve) OR (hieu van)) cau luu van thanh de cua tre*".