Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hanh vai » hanh vi, hanh va, hanh tai
viec cac » vien cac, viec cua, viec lam
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa
san ky » sang ky, van ky, ban ky
dan ky » van ky
cua te » cua tu
x hoi » o 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: vu ((san ky) or (dan ky)) nang ((x hoi) OR (xa hoi)). hieu viec cac tuc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((san ky) OR (dan ky)) nang ((x hoi) OR (xa hoi)). hieu viec cac tuc va hanh vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((san ky) or (dan ky)) nang ((x hoi) OR (xa hoi)). hieu viec cac tuc va hanh vai cua te*".