Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, dam thuc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, lai va
hai va » hai van, thai va, hoi 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 y nang ma hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh ((vai va) or (hai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh ((vai va) OR (hai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh ((vai va) or (hai va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ve ((cam tuc) OR (nam thuc)) va hanh ((vai va) or (hai va)) triet*.