Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tham thuc » nham thuc, pham thuc, tam thuc
vua chua » sua chua, cua chua, tua chua
nang mai » nang ma, nang tai, lang mai
thuc ban » thuoc ban, thuc dan, thu ban
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
va chua » ca chua, va chu, a chua
mai hoi » mai khoi, dai hoi, lai hoi
va cua » via cua, ca cua, ma cua
tu cao » cu cao, tu cac, vu cao

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 cao ky nang mai hoi. hieu ve tham thuc ban thanh ((va cua) OR (((va chua) OR (vua chua)))) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang mai hoi. hieu ve tham thuc ban thanh ((va cua) or (((va chua) OR (vua chua)))) tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang mai hoi. hieu ve tham thuc ban thanh ((va cua) or (((va chua) OR (vua chua)))) tre*.