Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh le » thinh le, thanh ve, thanh de
thu sach » thuat sach, thuoc sach, thu hoach
lang van » dang van, tang van, hoang van
cam thuc » nam thuc, cam thu, can thuc
hieu ve » hieu va, hieu van
tu sach » su sach, te sach, tu cach
van hoi » van hoa, van hoc, van hoe
ty lang » tay lang, ty xang, ty hang
le cua » ly 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) OR (thu sach)) ty lang van hoi. hieu ve ((cam thuc) or (am thuc)) ban thanh le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty lang van hoi. hieu ve ((cam thuc) OR (am thuc)) ban thanh le cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty lang van hoi. hieu ve ((cam thuc) or (am thuc)) ban thanh le cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty lang van hoi. hieu ve ((cam thuc) or (am thuc)) ban thanh le cua vat*.