Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua viet » ca viet, hoa viet, cua vat
lang xa » dang xay, lang van
lang ha » long ha
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
te sach » toc sach
sach v » sach va, sach y, sach 2
vi cua » vai cua, di cua

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v ((lang xa) OR (lang ha)) hoi. hieu ve cham thuc va danh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: te sach v ((lang xa) OR (lang ha)) hoi. hieu ve cham thuc va danh vi cua viet*.