Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoa doanh » toan doanh, hoa dan
doanh hoc » danh hoc, doanh khoa, doanh hoan
van thanh » ban thanh, van tuan
sach hoi » sach doi, sach moi, cach thoi
cong hoa » dong hoa, dong hoc, hang hoa
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
ma hai » ta hai, xa hai, manh hai
va hai » van hai, va chai, va khai

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 hoi tai, nghien cua cong hoa doanh doanh hoc ((ma hai) OR (va hai)) van thanh san~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tai, nghien cua cong hoa doanh doanh hoc ((ma hai) OR (va hai)) van thanh san".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tai, nghien cua cong hoa doanh doanh hoc ((ma hai) OR (va hai)) van thanh san*.