Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
nang mai » nang ma, nang tai, lang mai
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
mai hoi » mai khoi, dai hoi, lai hoi
co sach » bo sach, cuon sach, hoc sach
cau luc » cau truc, cau phuc
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang

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)) y nang mai hoi. hieu van cau luc 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)) y nang mai hoi. hieu van cau luc 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)) y nang mai hoi. hieu van cau luc va ((danh vi) OR (danh di)) va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang mai hoi. hieu van cau luc va ((danh vi) OR (danh di)) va triet*.