Perhaps you should try some spelling variations:
ban thanh » ban hanh
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang ha » long ha
hieu ve » hieu va, hieu van
ly cua » le cua

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 ty lang ha noi. hieu ve ((cam thuc) OR (nam thuc)) ((ban thanh) or (ban hang)) ly cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang ha noi. hieu ve ((cam thuc) OR (nam thuc)) ((ban thanh) OR (ban hang)) ly cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty lang ha noi. hieu ve ((cam thuc) OR (nam thuc)) ((ban thanh) or (ban hang)) ly cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang ha noi. hieu ve ((cam thuc) OR (nam thuc)) ((ban thanh) or (ban hang)) ly cua vat*.