Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
so doanh » so danh, su doanh, hoa doanh
hoan hoc » hoa hoc, toan hoc, hoang hoa
nhan dan » phan dau, gian dan, nhan tai
su mach » su sach
long so » long soc, cong so, dong so
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va phan
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su mach hoc tap, nghien cuu long so doanh hoan hoc ((ma hoi) OR (mai hoi)) va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su mach hoc tap, nghien cuu long so doanh hoan hoc ((ma hoi) OR (mai hoi)) va nhan dan".
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu long so doanh hoan hoc ((ma hoi) OR (mai hoi)) va nhan dan*.