Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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 cac truc ((va hanh) or (van hanh)) ((vai cua) OR (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve cac truc ((va hanh) OR (van hanh)) ((vai cua) OR (dai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu ve cac truc ((va hanh) or (van hanh)) ((vai cua) OR (dai cua)) triet*".