Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
ve caic » ve cac
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ve cai » va cai, ve cac, ve tai
dao va » dao van, tao va, do va
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu ((ve cai) or (ve caic)) dao va hanh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu ((ve cai) OR (ve caic)) dao va hanh di va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu ((ve cai) or (ve caic)) dao va hanh di va triet*.