Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cham thuc » nham thuc, pham thuc, tham thuc
tu cach » tu cac
danh le » dinh le, manh le, anh le
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 cach thuc ((nang xa) OR (lang xa)) hoi. hieu va cham thuc va danh le ((cua tu) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach thuc ((nang xa) or (lang xa)) hoi. hieu va cham thuc va danh le ((cua tu) OR (cua su))~".
• Adding a wildcard symbol may retrieve word variants: tu cach thuc ((nang xa) or (lang xa)) hoi. hieu va cham thuc va danh le ((cua tu) OR (cua su))*.