Perhaps you should try some spelling variations:
su sach » so sach
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
ve bac » ve bao, ve cac, ve ban
bac so » bac son, bac si, bac bo
vi cua » di cua
x hoi » xa hoi, o hoi, x ho
so va » so van, so vat, su 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 (vu sach)) ky nang x hoi. hieu ve bac so va hanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu ve bac so va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang x hoi. hieu ve bac so va hanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x hoi. hieu ve bac so va hanh ((vi cua) OR (vai cua)) triet*.