Perhaps you should try some spelling variations:
sach luan » sach luyen, sach han, san luan
sach tang » sach nang, sach tranh, mach tiang
luan tri » quan tri, luan thi, luat tri
suat tri » luat tri, sut tri, quan tri
tang tai » hang tai, dung tai, sang tao
vu sach » vu bach, su sach, vu khach
vu nang » vuc nang, va nang, vu dang
so sach » so sanh, bo sach, co sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( vu sach luan tri ) or ( vu nang suat tri ))) or ( so sach tang tai ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( vu sach luan tri ) OR ( vu nang suat tri ))) OR ( so sach tang tai )).
• Adding a wildcard symbol may retrieve word variants: (((( vu sach luan tri ) or ( vu nang suat tri ))) or ( so sach tang tai ))*.