Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
bo sac » bo sach
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua
hang » dang, bang, hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc ((ban thanh) or (ngan hang)) va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc ((ban thanh) OR (ngan hang)) va cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc ((ban thanh) or (ngan hang)) va cua triet*".