Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
doanh khoa » toan khoa
hoa doanh » toan doanh, hoa dan
toc sach » hoc sach, doc sach, thuoc sach
thue tai » thu tai, thuyet tai, thuoc tai
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
toan tai » toan tap, doanh tai, toan ban
ca toan » cua toan, va toan, bai toan
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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) or (toc sach)) thue tai, nghien thu cong hoa doanh khoa hoc xa hoi ca toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thue tai, nghien thu cong hoa doanh khoa hoc xa hoi ca toan tai.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) thue tai, nghien thu cong hoa doanh khoa hoc xa hoi ca toan tai*.