Perhaps you should try some spelling variations:
van lanh » van anh, van hanh, van manh
dao cua » dai cua, day cua, dan cua
duc van » duc va, duc tan, duc manh
tu san » thu san, tu ban, tu can
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
san ky » sang ky, van ky, dan ky
cua te » cua tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (ve cac)) duc van lanh dao cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) OR (ve cac)) duc van lanh dao cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (ve cac)) duc van lanh dao cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (ve cac)) duc van lanh dao cua te*.