Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
tay lang » tai lang, tay tang, tay quang
thuc ban » thuoc ban, thuc dan, thu ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
y lang » o lang, _ lang, yen lang
ve cua » le cua, te cua, ve cum
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((y lang) or (tay lang)) van hoi. hieu ve cham thuc ban hang ((ve cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y lang) OR (tay lang)) van hoi. hieu ve cham thuc ban hang ((ve cua) OR (de cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y lang) or (tay lang)) van hoi. hieu ve cham thuc ban hang ((ve cua) or (de cua)) tre*.