Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang mai » dang hai, dang mau, dang bai
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
mai hoi » mai khoi, dai hoi, lai hoi
ve chat » van chat
va chat » van chat, va phat, cao chat
duc ban » duc tan, duc van, dua ban
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 mai hoi. hieu ((ve chat) or (va chat)) duc ban thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang mai hoi. hieu ((ve chat) OR (va chat)) duc ban thanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang mai hoi. hieu ((ve chat) or (va chat)) duc ban thanh vi cua vat*.