Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
su sach » vu sach
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
thiet » thieu

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 ma hoi. hieu ve nam thuc va hanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang ma hoi. hieu ve nam thuc va hanh vai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang ma hoi. hieu ve nam thuc va hanh vai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang ma hoi. hieu ve nam thuc va hanh vai ((va triet) or (va thiet))*.