Perhaps you should try some spelling variations:
hieu toi » hieu moi, hieu loi, hieu voi
toi pham » tac pham, vi pham, thi phap
van tuan » van quan, van ban, anh tuan
chua tre » chua tri, cua tre, chua trieu
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dong » ly dong, ky dang, ky cong
duc van » duc va, duc tan, duc manh
tuan va » toan va, luan va, quan va
chu tri » chua tri, chu thi, chu tai
co doi » cho doi, co dot, co dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky dong co doi. hieu toi pham duc van tuan va ((chua tre) or (chu tri))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dong co doi. hieu toi pham duc van tuan va ((chua tre) OR (chu tri)).
• Adding a wildcard symbol may retrieve word variants: so sach ky dong co doi. hieu toi pham duc van tuan va ((chua tre) or (chu tri))*.