Perhaps you should try some spelling variations:
cuu thong » cuu thuong, cuu tong, cuu chong
hoc doanh » hoa doanh, hoc danh, hoc dan
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
so mach » so sach, tao mach, kon mach
van tai » von tai, van tuan
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 thong ((hoc doanh) or (hoa dan)) khoa hoc ma hoi va van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so mach hoc tap, nghien cuu thong ((hoc doanh) OR (hoa dan)) khoa hoc ma hoi va van tai.
• Adding a wildcard symbol may retrieve word variants: so mach hoc tap, nghien cuu thong ((hoc doanh) or (hoa dan)) khoa hoc ma hoi va van tai*.