Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach nuoc » sach duoc, cac nuoc, bach tuoc
hoc nganh » hoc nhanh
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
mai khoi » mai khoa, tai khoa, cac khoi
nhan dan » phan dau, gian dan, nhan tai
hoc mai » hoc ma, hoc dai, hoc bai
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 ((sach nuoc) or (dich hoc)) tap, nghien cuu cong hoc nganh khoa hoc mai khoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach nuoc) OR (dich hoc)) tap, nghien cuu cong hoc nganh khoa hoc mai khoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((sach nuoc) or (dich hoc)) tap, nghien cuu cong hoc nganh khoa hoc mai khoi ca nhan dan*.