Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
doanh khoa » toan khoa
noi doanh » voi doanh, doi doanh, tri doanh
ban thanh » ban hanh, ban hang
sach hoc » cach hoc, sach hoi, mach hoc
cong noi » cong nhoi, cong goi, cong soi
khoa hoc » hoa hoc
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoc tap, nghien thu cong noi doanh khoa hoc ma hoi ((ca nhan) or (ban thanh)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien thu cong noi doanh khoa hoc ma hoi ((ca nhan) OR (ban thanh)) van.
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien thu cong noi doanh khoa hoc ma hoi ((ca nhan) or (ban thanh)) van*.