Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh de » hanh de, thanh ve, thanh do
thuc ban » thuoc ban, thuc dan, thu ban
cam thuc » am thuc, nam thuc, cam thu
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
su viet » so viet
va cam » va cham, va cac, va cao
de su » den su, ve su, de tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (dang xay)) hoi. hieu va cam thuc ban thanh de su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (dang xay)) hoi. hieu va cam thuc ban thanh de su viet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (dang xay)) hoi. hieu va cam thuc ban thanh de su viet*.