Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
luc ban » duc ban, cuc ban, luc bat
ve chat » van chat
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky danh
vi cua » vai cua, di cua

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 dang) OR (ky nang)) mai hoi. hieu ((ve chat) or (va chat)) luc ban thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky nang)) mai hoi. hieu ((ve chat) OR (va chat)) luc ban thanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) OR (ky nang)) mai hoi. hieu ((ve chat) or (va chat)) luc ban thanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) OR (ky nang)) mai hoi. hieu ((ve chat) or (va chat)) luc ban thanh vi cua vat*.