Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
minh dai » minh dao, sinh dai, minh hai
duc van » duc tan, duc manh, duc phan
tu ban » thu ban, te ban
ban ky » van ky, dan ky
va cam » va cham, va cac, va cao
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

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