Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
ve bac » ve cac, ve ban, he bac
ve bao » te bao, va bao
so van » su van, vo van
vi cua » di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu ((ve bac) or (ve bao)) so van hanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((ve bac) OR (ve bao)) so van hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((ve bac) or (ve bao)) so van hanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((ve bac) or (ve bao)) so van hanh ((vi cua) OR (vai cua)) triet*.