Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
vu mach » vi mach, vu bach, vu manh
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va nha
va phan » van phan, va phat, va phap

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu mach hoc tap, nghien cac cong hoc nganh khoa hoc mai hoi ((va nhan) OR (va phan)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu mach hoc tap, nghien cac cong hoc nganh khoa hoc mai hoi ((va nhan) OR (va phan)) van".
• Adding a wildcard symbol may retrieve word variants: vu mach hoc tap, nghien cac cong hoc nganh khoa hoc mai hoi ((va nhan) OR (va phan)) van*.