Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
danh nhan » doanh nhan, thanh nhan, benh nhan
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoa danh » hoa doanh, hoa dan, hop danh
nhan dan » phan dau, gian dan, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien cuu cong hoc doanh ((khoa hoc) or (hoa hoc)) ma hoa danh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu cong hoc doanh ((khoa hoc) OR (hoa hoc)) ma hoa danh nhan dan.
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu cong hoc doanh ((khoa hoc) or (hoa hoc)) ma hoa danh nhan dan*.