Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach ty » sach y, sach tu, sach thu
ca chua » ca cua, sua chua
va chua » vua chua, va chu, a chua
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
ve cao » va cao, ve bao, ve co
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty sang ma hoi. hieu ((ve cao) OR (ve cac)) duc ban thanh ((va chua) or (ca chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty sang ma hoi. hieu ((ve cao) OR (ve cac)) duc ban thanh ((va chua) OR (ca chua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty sang ma hoi. hieu ((ve cao) OR (ve cac)) duc ban thanh ((va chua) or (ca chua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty sang ma hoi. hieu ((ve cao) OR (ve cac)) duc ban thanh ((va chua) or (ca chua)) tre*.