Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
vien cac » vien bach, vien dai, vien da
van hanh » ban hanh, van anh, van ban
viec cac » viec cua, viec lam, viec va
vai cua » dai cua, hai cua, lai cua
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
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: vu san ky nang x hoi. hieu ((viec cac) or (vien cac)) luc ((van hanh) OR (van thanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang x hoi. hieu ((viec cac) OR (vien cac)) luc ((van hanh) OR (van thanh)) vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky nang x hoi. hieu ((viec cac) or (vien cac)) luc ((van hanh) OR (van thanh)) vai cua te*".