Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ly doanh » ly anh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
cau luc » cau truc, cau phuc
va danh » va dinh, va dan, va hanh

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

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