Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
khong hoc » khung hoc, thong hoc, khong thuoc
toc mach » toc sach, hoc mac, tim mach
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
va pham » van pham, va phat, va phan
va phap » va phat, ban phap

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc mach hoc tap, nghien cuu khoa hoc nganh khong hoc ma hoa ((va pham) OR (va phap)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc mach hoc tap, nghien cuu khoa hoc nganh khong hoc ma hoa ((va pham) OR (va phap)) van".
• Adding a wildcard symbol may retrieve word variants: toc mach hoc tap, nghien cuu khoa hoc nganh khong hoc ma hoa ((va pham) OR (va phap)) van*.