Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh le » thinh le, thanh ve, thanh de
sach thu » sach thue, sach thieu, sach tham
lang van » dang van, hoang van, giang van
thuc ban » thuoc ban, thuc dan, thu ban
tang van » dang van, hoang van, trong van
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
ve cam » ve cham, ve cac, va cam
le cua » ly cua

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

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