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

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