Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thong hoc » thuong hoc, tuong hoc, thong hoa
mach hoc » cach hoc, dich hoc, anh hoc
tong hoc » tuong hoc, trong hoc, tong hop
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
so mach » so sach, tao mach, kon mach
va nhan » van nhan, ca nhan, va phan
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: so mach hoc tap, nghien cuu ((tong hoc) OR (thong hoc)) doanh khoa hoc ma hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so mach hoc tap, nghien cuu ((tong hoc) OR (thong hoc)) doanh khoa hoc ma hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: so mach hoc tap, nghien cuu ((tong hoc) OR (thong hoc)) doanh khoa hoc ma hoi va nhan dan*.