Perhaps you should try some spelling variations:
sanh hoc » sinh hoc, anh hoc, danh hoc
cuu cong » cua cong, thu cong, cac cong
cau nhan » chau nhan, ca nhan, cu nhan
nhan dan » phan dau, gian dan, nhan tai
so sanh » do sanh
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
hoi cau » hoi chu, hoc cau, hoa cau
toan » tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh hoc tap, nghien cuu cong ((hoa dan) or (toan doanh)) hoa hoc mai hoi cau nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh hoc tap, nghien cuu cong ((hoa dan) OR (toan doanh)) hoa hoc mai hoi cau nhan dan.
• Adding a wildcard symbol may retrieve word variants: so sanh hoc tap, nghien cuu cong ((hoa dan) or (toan doanh)) hoa hoc mai hoi cau nhan dan*.