Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoc toan » hoc tan, hop toan, hoa toan
dan nhan » danh nhan, dan chan, van nhan
nhan tao » nhan tai, nhan dan
te mach » ke mach, te sach, tim mach
hoi dan » hoa dan, hoi dap, thoi dai

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 khoa ((hoc dai) OR (hoc dan)) 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 khoa ((hoc dai) OR (hoc dan)) hoi dan nhan tao".
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cuu cong hoc toan khoa ((hoc dai) OR (hoc dan)) hoi dan nhan tao*.