Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
mach hoc » cach hoc, dich hoc, bac hoc
cong hoa » dong hoa, dong hoc, hang hoa
hoa toan » hoa tan, hop toan, hoa than
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
anh hoc » sinh hoc, benh hoc, hinh hoc
hoc dai » hoc dan
dai hoi » dai hoc, dai hai, dai moi
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((mach hoc) or (anh hoc)) tap, nghien thu cong hoa toan khoa hoc dai hoi va nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (anh hoc)) tap, nghien thu cong hoa toan khoa hoc dai hoi va nhan van.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (anh hoc)) tap, nghien thu cong hoa toan khoa hoc dai hoi va nhan van*.