Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
cac toi » cac thoi
hieu ve » hieu va, hieu van
su sach » vu sach
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
ve cac » va cac, vien cac
y nang » ky nang, v nang, may nang
toi va » thoi va, tuoi va, hoi va
vai va » mai va, dai va, hai va
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 (so sach)) ((y nang) or (ly nang)) ma hoi. hieu ve cac toi va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((y nang) OR (ly nang)) ma hoi. hieu ve cac toi va hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ((y nang) or (ly nang)) ma hoi. hieu ve cac toi va hanh vai va triet*.