Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
toc sach » hoc sach, doc sach, thuoc sach
sach duy » sach dung, sach duoc, sach dao
duy sang » duy van, duy can, duy anh
lap cua » lai cua, tap cua, lam cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi

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 duy sang ((ma hoi) OR (xa hoi)). hieu ve ((pham duy) or (pham duc)) gia thanh lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach duy sang ((ma hoi) OR (xa hoi)). hieu ve ((pham duy) OR (pham duc)) gia thanh lap cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach duy sang ((ma hoi) OR (xa hoi)). hieu ve ((pham duy) or (pham duc)) gia thanh lap cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach duy sang ((ma hoi) OR (xa hoi)). hieu ve ((pham duy) or (pham duc)) gia thanh lap cua tre*.