Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec lam » viec va
hanh vai » hanh vi, hanh va, hanh tai
nang xa » lang xa, nang ma, mang xa
lam luc » lao luc, lam duoc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
san ky » sang ky, dan ky, ban ky
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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 (van ky)) ((nang xa) or (nang x)) hoi. hieu viec lam luc va hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((san ky) OR (van ky)) ((nang xa) OR (nang x)) hoi. hieu viec lam luc va hanh vai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((san ky) OR (van ky)) ((nang xa) or (nang x)) hoi. hieu viec lam luc va hanh vai cua tu*".