Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
dai hoi » dai hoc, dai hai, dai moi
sach ty » sach y, sach tu, sach thu
van cac » van hac, van cau, van bac
van dau » van dao, phan dau
dat ban » bat ban, da ban, day ban
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
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: thu sach ty nang ((ma hoi) or (dai hoi)). hieu ((van cac) or (van dau)) dat ban thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((ma hoi) OR (dai hoi)). hieu ((van cac) OR (van dau)) dat ban thanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((ma hoi) or (dai hoi)). hieu ((van cac) or (van dau)) dat ban thanh vi cua vat*.