Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoi » sach doi, sach moi, cach thoi
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
mot hoc » mon hoc, mo hoc, mot goc
va nhan » van nhan, va phan, va nha
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoi dap, nghien cua mot hoc doanh khoa hoc xa hoi ((va nhan) or (ca nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi dap, nghien cua mot hoc doanh khoa hoc xa hoi ((va nhan) OR (ca nhan)) van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi dap, nghien cua mot hoc doanh khoa hoc xa hoi ((va nhan) or (ca nhan)) van*.