Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
sach thue » sach thieu, sach tham, cach thuc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sach thu » sach thieu, sach tham, cach thuc
lai cua » dai cua, hai cua, lai chau
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
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: tu ((sach thu) or (sach thue)) nang xa hoi. ((hieu ve) OR (hieu van)) pham duc va thanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) nang xa hoi. ((hieu ve) OR (hieu van)) pham duc va thanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach thue)) nang xa hoi. ((hieu ve) OR (hieu van)) pham duc va thanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thue)) nang xa hoi. ((hieu ve) OR (hieu van)) pham duc va thanh lai cua tre*.