Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
phong hoc » phong ho, thong hoc, phuong hoa
danh nhan » thanh nhan, benh nhan, dung nhan
tu sinh » thu sinh, tuc sinh, tu minh
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ma hoi » mai hoi, xa hoi, ma hoa

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

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