Perhaps you should try some spelling variations:
chua tri » chu tri, chua trieu, chua tivi
hieu toi » hieu moi, hieu loi, hieu voi
chua tre » cua tre, chua trieu, cho tre
toi pham » tac pham, vi pham, thi phap
duc van » duc va, duc tan, duc manh
sach ky » sac ky, sach y, sach ty
tuan va » luan va, quan va, than va
toan va » doan va, tran van, toan ban
ky dong » ly dong, ky dang, ky cong
so sach » so sanh, bo sach, co sach
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) OR (toan va)) ((chua tre) or (chua 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) OR (toan va)) ((chua tre) OR (chua tri)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dong co doi. hieu toi pham duc van ((tuan va) OR (toan va)) ((chua tre) or (chua tri))".
• Adding a wildcard symbol may retrieve word variants: so sach ky dong co doi. hieu toi pham duc van ((tuan va) OR (toan va)) ((chua tre) or (chua tri))*.