Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
cam luc » cam xuc, cau luc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lam lai » lam tai, lay lai, lam lam
lap hai » lap tai, lap lai, lap hoat
ky sang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
va don » va dong, va doc, va do
vi cua » vai cua, di cua

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 ky sang ((lap hai) or (lam lai)). hieu ve cam luc va don ((vi cua) or (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((lap hai) OR (lam lai)). hieu ve cam luc va don ((vi cua) OR (hai cua)) te.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((lap hai) or (lam lai)). hieu ve cam luc va don ((vi cua) or (hai cua)) te*.