Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc doanh » hoc danh, hoc dan, hoc nganh
hoa doanh » toan doanh, hoa dan
thuc nhan » thuoc nhan, thu nhan, thuc chan
sach hoc » cach hoc, sach hoi, mach hoc
cua than » cua thanh, cua nhan, cua han
khoa hoc » hoa hoc
hoi thuc » choi thuc, hoc thuc, hoi chuc
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
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: su sach hoc tap, nghien cua than ((hoc doanh) or (hoa doanh)) khoa hoc xa hoi thuc nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cua than ((hoc doanh) OR (hoa doanh)) khoa hoc xa hoi thuc nhan dan.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cua than ((hoc doanh) or (hoa doanh)) khoa hoc xa hoi thuc nhan dan*.