Perhaps you should try some spelling variations:
kho tang » cao tang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
lap hai » lap tai, lap lai, lap hoat
ky tang » ky nang, ky dang, ky trong
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc va
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
cua te » cua tu

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 ((ky tang) OR (kho tang)) lap hai. hieu ve cam ((loc va) OR (duc va)) dan vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) lap hai. hieu ve cam ((loc va) or (duc va)) dan vi cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (kho tang)) lap hai. hieu ve cam ((loc va) or (duc va)) dan vi cua te*.