Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc doanh » hoc danh, hoc dan, hoc nganh
hoa doanh » toan doanh, hoa dan
toc sach » hoc sach, doc sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
cac cong » cua cong
phan dau » phan tu, hang dau
doi tap » doi tac, doi dap, doi tai
va phan » van phan, va phat, va phap
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: toc sach doi tap, nghien cac cong ((hoc doanh) or (hoa doanh)) hoa hoc ma hoi va phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach doi tap, nghien cac cong ((hoc doanh) OR (hoa doanh)) hoa hoc ma hoi va phan dau.
• Adding a wildcard symbol may retrieve word variants: toc sach doi tap, nghien cac cong ((hoc doanh) or (hoa doanh)) hoa hoc ma hoi va phan dau*.