Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, 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: su sach thu nang ((x hoi) or (x ho)). hieu vien cac ((xuc van) OR (duc van)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ((x hoi) OR (x ho)). hieu vien cac ((xuc van) OR (duc van)) hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang ((x hoi) or (x ho)). hieu vien cac ((xuc van) OR (duc van)) hanh vi cua triet*".