Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
thu sach » thuat sach, thuoc sach, thu hoach
dang mai » dang hai, dang mau, dang bai
tu sach » su sach, te sach, tu cach
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
y dang » ky dang, 2 dang, _ dang
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) OR (thu sach)) y dang 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) OR (thu sach)) y dang 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) OR (thu sach)) y dang mai hoi. hieu ((ve chat) or (va chat)) luc ban thanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y dang mai hoi. hieu ((ve chat) or (va chat)) luc ban thanh vi cua vat*.