Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tinh hoc » sinh hoc, tin hoc, hinh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
cac khoi » cac thoi, cac khoan, cach thoi
nhan dan » phan dau, gian dan, nhan tai
hoc cac » hoc cao
khoi ca » khoi can, khoi cua, khoi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cac nuoc) or (tinh hoc)) tap, nghien cuu cong hoc nganh khoa hoc cac khoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cac nuoc) OR (tinh hoc)) tap, nghien cuu cong hoc nganh khoa hoc cac khoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((cac nuoc) or (tinh hoc)) tap, nghien cuu cong hoc nganh khoa hoc cac khoi ca nhan dan*.