Perhaps you should try some spelling variations:
su sach » so sach, vu sach
lap lai » lap tai, lay lai, lam lai
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lap hai » lap tai, lap hoat, lanh hai
ky sang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc 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 sang ((lap hai) OR (lap lai)). hieu ve cam ((luc va) OR (duc va)) dan vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((lap hai) OR (lap lai)). hieu ve cam ((luc va) or (duc va)) dan vi cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((lap hai) OR (lap lai)). hieu ve cam ((luc va) or (duc va)) dan vi cua te*.