Perhaps you should try some spelling variations:
dang dien » dang dieu, hang dien, dong dien
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
thu van » thuc van, thuy van, chu van
dien va » dien hoa
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
tu van » tu va
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ((ve cam) OR (va cac)) ((thu van) OR (tu van)) dang dien va triet~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ((ve cam) or (va cac)) ((thu van) or (tu van)) dang dien va triet*.