Perhaps you should try some spelling variations:
khoi nganh » hoc nganh, moi nganh
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach duoc » sach nuoc, sach dao, sach dung
cach thuc » anh thuc, cac thu
cong khoi » cong khi, cong nhoi, tong khoi
luan nhan » luan phan, luan nha, xuan nhan
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
tap khoa » tap hoa, lap khoa, phap khoa
nhan va » nhan tai, nhan dan, nhan tao

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 duoc) or (cach thuc)) tap, nghien cuu cong khoi nganh khoa hoc tap khoa luan nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach duoc) OR (cach thuc)) tap, nghien cuu cong khoi nganh khoa hoc tap khoa luan nhan va.
• Adding a wildcard symbol may retrieve word variants: tu ((sach duoc) or (cach thuc)) tap, nghien cuu cong khoi nganh khoa hoc tap khoa luan nhan va*.