Perhaps you should try some spelling variations:
mach hoc » dich hoc, anh hoc, bac hoc
cach hoc » cach thuc, cach thoi, dich hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
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: su ((mach hoc) OR (cach hoc)) tap, nghien cuu tong hoc dan khoa hoc ma hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((mach hoc) OR (cach hoc)) tap, nghien cuu tong hoc dan khoa hoc ma hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: su ((mach hoc) OR (cach hoc)) tap, nghien cuu tong hoc dan khoa hoc ma hoi va nhan dan*.