Perhaps you should try some spelling variations:
sinh dai » sinh thai, si dai, sinh vat
van sinh » van minh, va sinh, van dinh
duc van » duc va, duc tan, duc manh
tu ban » thu ban, te ban
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
ban 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 ban ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (ve cac)) duc van sinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) OR (ve cac)) duc van sinh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (ve cac)) duc van sinh dai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ban ky nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (ve cac)) duc van sinh dai cua te*.