Perhaps you should try some spelling variations:
doanh thuong » doan phuong, anh thuong, dinh thuong
doanh nhung » doanh chung, doanh nhan, doan hung
mach hoc » cach hoc, dich hoc, anh hoc
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
cuoc xa » duoc xa, uoc xa, cuoc tao
va nhan » van nhan, ca nhan, va phan
mo hoc » mon hoc, co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cuu mo hoc ((doanh thuong) or (doanh nhung)) cuoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu mo hoc ((doanh thuong) OR (doanh nhung)) cuoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu mo hoc ((doanh thuong) or (doanh nhung)) cuoc xa hoi va nhan dan*.