Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
hoc toan » hoc tan, hoa toan, hoc than
hop toan » hop hoan, phap toan, tap toan
khoa hoc » hoa hoc
dan nhan » danh nhan, dan chan, van nhan
nhan tao » nhan tai, nhan dan
te mach » ke mach, te sach, tim mach
hoc dai » hoc dan
dai hoi » dai hoc, dai hai, dai moi
hoi dan » hoa dan, hoc dan, hoi dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: te mach hoc tap, nghien cuu cong ((hoc toan) OR (hop toan)) khoa hoc dai hoi dan nhan tao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te mach hoc tap, nghien cuu cong ((hoc toan) OR (hop toan)) khoa hoc dai hoi dan nhan tao".
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cuu cong ((hoc toan) OR (hop toan)) khoa hoc dai hoi dan nhan tao*.