Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
coc nganh » hoc nganh, cac nganh, chuc nganh
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
cau nhan » chau nhan, ca nhan, cu nhan
nhan dan » phan dau, gian dan, nhan tai
hoi cau » hoi chu, hoc cau, hoa cau
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach hoc) or (sach hoi)) tap, nghien cuu cong coc nganh khong hoc xa hoi cau nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach hoc) OR (sach hoi)) tap, nghien cuu cong coc nganh khong hoc xa hoi cau nhan dan.
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) or (sach hoi)) tap, nghien cuu cong coc nganh khong hoc xa hoi cau nhan dan*.