Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh khoa » nganh hoa, nganh khong, doanh khoa
mach hoc » cach hoc, dich hoc, anh hoc
cong hoc » dong hoc, cong coc, cong ho
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
anh nhan » danh nhan, doanh nhan, thanh nhan
nhan dan » phan dau, gian dan, nhan tai
bo mach » bo sach, ban mach, bo trach
hoc lua » hoc luan, hoc luat, hoc cua
lua hai » qua hai, cua hai, lua lai
hai anh » ha anh, mai anh, hai thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo mach hoc tap, nghien cac ((cong hoc) or (cong hoa)) nganh khoa hoc lua hai anh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo mach hoc tap, nghien cac ((cong hoc) OR (cong hoa)) nganh khoa hoc lua hai anh nhan dan.
• Adding a wildcard symbol may retrieve word variants: bo mach hoc tap, nghien cac ((cong hoc) or (cong hoa)) nganh khoa hoc lua hai anh nhan dan*.