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

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) OR (nang ma)) hoi. hieu van 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) OR (nang ma)) hoi. hieu van 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) OR (nang ma)) hoi. hieu van cau luc ((va danh) or (ly doanh)) va su triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) OR (nang ma)) hoi. hieu van cau luc ((va danh) or (ly doanh)) va su triet*.