Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh vai » hanh vi, hanh va, hanh tai
vien cac » vien bach, vien dai, vien da
toc sach » hoc sach, doc sach, thuoc sach
mai hoi » mai khoi, dai hoi, lai hoi
sach tu » sach thu, cach tu, sach ty
luc van » luoc van, luu van, duc van
xuc ban » duc ban, cuc ban, quoc ban
tu nang » tru nang, tu nong, tu nano
vai cua » dai cua, hai cua, lai cua
ma hoi » xa hoi, ma hoa, me hoi
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: toc sach tu nang ((ma hoi) OR (mai hoi)). hieu vien cac ((luc van) or (xuc ban)) hanh vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang ((ma hoi) OR (mai hoi)). hieu vien cac ((luc van) OR (xuc ban)) hanh vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang ((ma hoi) OR (mai hoi)). hieu vien cac ((luc van) or (xuc ban)) hanh vai cua su".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang ((ma hoi) OR (mai hoi)). hieu vien cac ((luc van) or (xuc ban)) hanh vai cua su*.