Perhaps you should try some spelling variations:
ban thanh » ban hang
vai triet » va triet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van bac » van ban, van bao, van hac
va vai » va bai, va van, va dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. hieu van bac duc ((ban thanh) or (ban hanh)) va vai triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu van bac duc ((ban thanh) OR (ban hanh)) va vai triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van bac duc ((ban thanh) or (ban hanh)) va vai triet*.