Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh lap » thanh san, phan lap, thanh hai
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa

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

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