Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
van cac » van hac, van cau, van bac
dat ban » bat ban, da ban, day ban
van dau » van dao, phan dau
thu sac » thu sach, thu san, thu xac
dai hoi » dai hoc, dai hai, dai moi
sac ky » cac ky, sai ky
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 sac ky 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 sac ky 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 sac ky nang ((ma hoi) or (dai hoi)). hieu ((van cac) or (van dau)) dat ban thanh vi cua vat*.