Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ky nang xa hoi. ((hieu va) OR (hieu qua)) cac lo va hanh ((vai cua) or (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang xa hoi. ((hieu va) OR (hieu qua)) cac lo va hanh ((vai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang xa hoi. ((hieu va) OR (hieu qua)) cac lo va hanh ((vai cua) or (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang xa hoi. ((hieu va) OR (hieu qua)) cac lo va hanh ((vai cua) or (hai cua)) triet*.