Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
co sach » bo sach, cuon sach, hoc sach
van cau » van dau, van hau, van chat
ma hoi » mai hoi, xa hoi, ma hoa

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) or (co sach)) ky tang ma hoi. hieu van cau thuc va ((danh vi) OR (danh di)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky tang ma hoi. hieu van cau thuc va ((danh vi) OR (danh di)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky tang ma hoi. hieu van cau thuc va ((danh vi) OR (danh di)) va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky tang ma hoi. hieu van cau thuc va ((danh vi) OR (danh di)) va triet*.