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