Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
lai cua » dai cua, hai cua, lai chau
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 tu nang ((x hoi) or (o hoi)). hieu ve cam xuc van hanh ((vi cua) or (lai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang ((x hoi) OR (o hoi)). hieu ve cam xuc van hanh ((vi cua) OR (lai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang ((x hoi) or (o hoi)). hieu ve cam xuc van hanh ((vi cua) or (lai cua)) triet*.