Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
doi cua » dai cua, hoi cua
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
di cua » dai cua, de cua, do cua
su sai » su tai, su hai, su dai
sai ky » sac ky
ma hoi » xa hoi, ma hoa, me hoi
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 sai ky nang ((ma hoi) or (mai hoi)). hieu ve cac duc van hanh ((di cua) OR (doi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((ma hoi) OR (mai hoi)). hieu ve cac duc van hanh ((di cua) OR (doi cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((ma hoi) or (mai hoi)). hieu ve cac duc van hanh ((di cua) OR (doi cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((ma hoi) or (mai hoi)). hieu ve cac duc van hanh ((di cua) OR (doi cua)) triet*.