Perhaps you should try some spelling variations:
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
te mach » te sach, tim mach, tao mach
ke mach » ke hoach
hoc dai » hoc dan
dai hai » dai han, dai hoi, dai tai
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
hai va » hai van, thai va, hoi va

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) OR (ke mach)) hoc tap, nghien cuu cong hoc toan khoa hoc dai hai va nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te mach) OR (ke mach)) hoc tap, nghien cuu cong hoc toan khoa hoc dai hai va nhan va".
• Adding a wildcard symbol may retrieve word variants: ((te mach) OR (ke mach)) hoc tap, nghien cuu cong hoc toan khoa hoc dai hai va nhan va*.