Perhaps you should try some spelling variations:
danh tai » doanh tai, dinh tai, hanh tai
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
tai cua » thai cua, tai cuc, tri cua
sac ky » sai ky
co hoi » co loi
va am » va lam, va cam

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: thu ((sac ky) OR (cac ky)) nang ((co hoi) OR (co hoc)). hieu va am thuc va danh tai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) or (cac ky)) nang ((co hoi) OR (co hoc)). hieu va am thuc va danh tai cua viet~".
• Adding a wildcard symbol may retrieve word variants: thu ((sac ky) or (cac ky)) nang ((co hoi) OR (co hoc)). hieu va am thuc va danh tai cua viet*.