Perhaps you should try some spelling variations:
sach nang » cach mang, sach danh, sach song
de doanh » dao doanh, doi doanh, de thanh
te doanh » te danh, ty doanh, tri doanh
luan tri » quan tri, luan thi, luat tri
nang tai » hang tai, tang tai, sang tai
dung tri » dung tai, dung tren, dung sai
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((de doanh) OR (te doanh)) luan tri ) or ((( te sach nang tai ) or ( te sach dung tri ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((de doanh) OR (te doanh)) luan tri ) OR ((( te sach nang tai ) OR ( te sach dung tri )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((de doanh) OR (te doanh)) luan tri ) or ((( te sach nang tai ) or ( te sach dung tri ))))".
• Adding a wildcard symbol may retrieve word variants: (( ((de doanh) OR (te doanh)) luan tri ) or ((( te sach nang tai ) or ( te sach dung tri ))))*.