Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van dinh » van minh, van dich, va dinh
va triet » va thiet, va trien, ve triet
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cam duc » cao duc, pham duc, nam duoc
nang xa » nang x, nang ma, mang xa
dinh su » dinh so, hinh su, dinh cu
su va » su van, tu va

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 (lang xa)) hoi. hieu ve ((cam duc) or (cam xuc)) van dinh su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve ((cam duc) OR (cam xuc)) van dinh su va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve ((cam duc) or (cam xuc)) van dinh su va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve ((cam duc) or (cam xuc)) van dinh su va triet*.