Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cham » va chat, va tham
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
van cua » vang cua, dan cua, nan cua
ban cua » ban quan
su sac » su sach, su cac
su xac » pu xac, su cac
o lang » hoa lang, hoi lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) OR (su xac)) o lang xa hoi. hieu va cham thuc va dinh ((van cua) or (ban cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) o lang xa hoi. hieu va cham thuc va dinh ((van cua) OR (ban cua)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) o lang xa hoi. hieu va cham thuc va dinh ((van cua) or (ban cua)) viet*".