Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
luc van » luoc van, duc van, luc va
luu van » luan van, luu hanh
vai cua » dai cua, hai cua, lai cua
va cau » van cau, va cac, va dau
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach vu nang xa hoi. hieu va cau ((luc van) or (((luu van) OR (cuu van)))) hanh vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang xa hoi. hieu va cau ((luc van) OR (((luu van) OR (cuu van)))) hanh vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang xa hoi. hieu va cau ((luc van) or (((luu van) OR (cuu van)))) hanh vai cua su".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang xa hoi. hieu va cau ((luc van) or (((luu van) OR (cuu van)))) hanh vai cua su*.