Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
lap hai » lap tai, lap lai, lap hoat
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
ve cac » va cac, vien cac
luc ca » luc cao, luc cua, luc va
ca dan » cac dan, ca dao
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky sang) or (ky tang)) lap hai. hieu ve cac luc ca dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky tang)) lap hai. hieu ve cac luc ca dan vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky tang)) lap hai. hieu ve cac luc ca dan vi cua te*.