Perhaps you should try some spelling variations:
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
hoc tang » hoc bang, hoc tan, hoc tieng
hoi danh » hop danh, hoi dan, hoc danh
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach

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 hoc tap, nghien cuu dong hoc tang ((khoa hoc) or (hoa hoc)) xa hoi danh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong hoc tang ((khoa hoc) OR (hoa hoc)) xa hoi danh nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong hoc tang ((khoa hoc) or (hoa hoc)) xa hoi danh nhan dan*.