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
chuc nhan » thuc nhan, chuc nganh, chung nhan
sach hoc » cach hoc, sach hoi, mach hoc
cua than » cua thanh, cua nhan, cua han
khoa hoc » hoa hoc
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 chuc nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien cua than ((hoc doanh) OR (hoa doanh)) khoa hoc xa hoi chuc 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 chuc nhan dan*.