Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cham tuc » nham thuc, pham thuc, tham thuc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
su sach » vu sach
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
va cham » va chat, va tham
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
cat va » chat va, cat van, dat va

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