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