Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
cao thuc » bao thuc, can thuc, cao thu
toc sach » hoc sach, doc sach, thuoc sach
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
va nhan » van nhan, ca nhan, va phan
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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) or (toc sach)) ky lang xa hoi. lieu va ((cao thuc) or (cao thuoc)) va nhan tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky lang xa hoi. lieu va ((cao thuc) OR (cao thuoc)) va nhan tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky lang xa hoi. lieu va ((cao thuc) or (cao thuoc)) va nhan tai cuu tre*.