Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day danh » day manh, dai danh, dao danh
dau tren » dau tien, dat tren, dau tieng
hieu ve » hieu va, hieu van
danh vi » hanh vi, dinh vi, danh di
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi dau » vi dai, va dau, bi dau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day danh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. ((hieu ve) OR (thien van)) nam thuc day danh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day danh vi dau tren*.