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
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
danh vi » hanh vi, dinh vi, danh di
vi cau » va cau, ve cau, di cau
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 sach ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu ve) OR (thien van)) nam thuc day danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day danh vi cau tren*.