Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
khoi nganh » hoc nganh, moi nganh
nganh khoa » nganh hoa, nganh khong, doanh khoa
cong khoi » cong khi, cong nhoi, tong khoi
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
van phan » van phong, van thanh, luan phan
te mach » ke mach, te sach, tim mach
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: te mach hoc tap, nghien cua cong khoi nganh khoa hoc ma hoi ((va nhan) or (van phan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te mach hoc tap, nghien cua cong khoi nganh khoa hoc ma hoi ((va nhan) OR (van phan)) van.
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cua cong khoi nganh khoa hoc ma hoi ((va nhan) or (van phan)) van*.