Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
danh van » doanh van, dang van, dinh van
ky danh » ky anh, ky dang
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
dao cua » day cua, dan cua, do cua
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky danh van hoi. ((hieu ve) OR (hieu qua)) cac duc van hanh ((dao cua) OR (dai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky danh van hoi. ((hieu ve) or (hieu qua)) cac duc van hanh ((dao cua) OR (dai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: su xac ky danh van hoi. ((hieu ve) or (hieu qua)) cac duc van hanh ((dao cua) OR (dai cua)) triet*.