Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
lam chat » luan chat, cao chat, lam chu
van chat » cao chat
van cau » van dau, van hau, toan cau
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. hieu ((van cau) or (van chat)) duc ban thanh ((lam chat) OR (ly chat)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu ((van cau) OR (van chat)) duc ban thanh ((lam chat) OR (ly chat)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu ((van cau) or (van chat)) duc ban thanh ((lam chat) OR (ly chat)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu ((van cau) or (van chat)) duc ban thanh ((lam chat) OR (ly chat)) triet*.