Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
hanh don » hanh dong, nhanh dong, hanh doanh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
duc ban » duc tan, duc van, dua ban
don su » dong su, down su, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sach) or (so sach))) or (toc sach)) ky nang xa hoi. lieu va cham duc ban hanh don su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (so sach))) OR (toc sach)) ky nang xa hoi. lieu va cham duc ban hanh don su triet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (so sach))) or (toc sach)) ky nang xa hoi. lieu va cham duc ban hanh don su triet*.