Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve ban » te ban, va ban, ve bao
vi cau » va cau, ve cau, viet cau
di cau » da cau, diem cau
bo va » bao va, do va, co va
so va » so van, so vat, su va
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: su sach ky nang x hoi. hieu ve ban ((bo va) or (so va)) hanh ((vi cau) OR (di cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ve ban ((bo va) OR (so va)) hanh ((vi cau) OR (di cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ve ban ((bo va) or (so va)) hanh ((vi cau) OR (di cau)) tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ve ban ((bo va) or (so va)) hanh ((vi cau) OR (di cau)) tren*.