Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
duc ban » duc van, duc man, duc manh
hanh va » hang va, hanh vi
dua ban » dia ban, cua ban, qua ban
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
sach v » sach va, sach y, sach 2
nang o » nang co, nang ho, nang ro
v nang » va nang, vu nang, van nang
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang o hoi. hieu ve cac ((((duc ban) OR (duc tan))) OR (dua ban)) hanh va su triet~.
• Adding a wildcard symbol may retrieve word variants: su sach v nang o hoi. hieu ve cac ((((duc ban) or (duc tan))) or (dua ban)) hanh va su triet*.