Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam tu
va doanh » van doanh, vay doanh, hoa doanh
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
va ve » va de, va le, va vi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ma hoi. hieu ve ((nam thuc) or (nam thu)) ((va doanh) OR (va danh)) va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoi. hieu ve ((nam thuc) OR (nam thu)) ((va doanh) OR (va danh)) va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ma hoi. hieu ve ((nam thuc) or (nam thu)) ((va doanh) OR (va danh)) va ve triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoi. hieu ve ((nam thuc) or (nam thu)) ((va doanh) OR (va danh)) va ve triet*.