Perhaps you should try some spelling variations:
coc nganh » hoc nganh, cac nganh, chuc nganh
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
mai khoi » mai khoa, tai khoa, cac khoi
su bach » vu bach, su sach, huu bach
mai tap » bai tap, mai tat, mai tan
khoi va » hoi va, khi va, choi va
va phan » van phan, va phat, va phap
phan va » phan van, nhan va, han va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su bach mai tap, nghien cuu cong coc nganh ((khoa hoc) OR (hoa hoc)) mai khoi va phan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su bach mai tap, nghien cuu cong coc nganh ((khoa hoc) OR (hoa hoc)) mai khoi va phan va".
• Adding a wildcard symbol may retrieve word variants: su bach mai tap, nghien cuu cong coc nganh ((khoa hoc) OR (hoa hoc)) mai khoi va phan va*.