Perhaps you should try some spelling variations:
doanh phan » doanh nhan, doan phan, doanh thanh
thanh hoa » thanh pho
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
co thanh » cho thanh, o thanh, co tranh
tu sach » thu sach, su sach, te 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: tu sach hoc tap, nghien cuu dong co thanh hoa hoc xa hoi ((danh nhan) or (doanh phan)) dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong co thanh hoa hoc xa hoi ((danh nhan) OR (doanh phan)) dau.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong co thanh hoa hoc xa hoi ((danh nhan) or (doanh phan)) dau*.