Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
dang mai » dang hai, dang mau, dang bai
ve chat » van chat
duc ban » duc tan, duc van, dua ban
va chat » van chat, va phat, cao chat
sach ky » sach y, sach ty, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
sac ky » cac ky, sai ky
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) OR (sac 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) OR (sac ky)) dang mai hoi. hieu ((ve chat) OR (va chat)) duc ban thanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac 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) OR (sac ky)) dang mai hoi. hieu ((ve chat) or (va chat)) duc ban thanh vi cua vat*.