Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thinh le » trinh ly
toc sach » hoc sach, doc sach, thuoc sach
thanh le » thanh ve, thanh de, thanh liem
thuc ban » thuoc ban, thuc dan, thu ban
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang

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)) ty lang xa hoi. hieu ve cham thuc ban ((thanh le) or (thinh le)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ty lang xa hoi. hieu ve cham thuc ban ((thanh le) OR (thinh le)) cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ty lang xa hoi. hieu ve cham thuc ban ((thanh le) or (thinh le)) cua vat*.