Perhaps you should try some spelling variations:
bai triet » bai viet, tai thiet, va triet
ly doanh » ly anh
va doanh » van doanh, vay doanh, va danh
thu sach » tu sach, thuat sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cau luc » cau truc, cau phuc
nang xa » nang x, lang xa, mang xa
va cau » van cau, va cac, va dau

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

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