Perhaps you should try some spelling variations:
doanh khoa » toan khoa
chung nhan » chung khoan, dung nhan, chung nam
hoc doanh » hoa doanh, hoc danh, hoc dan
hoi chung » ho chung, chon chung, hoi thuong
sach hoc » cach hoc, sach hoi, mach hoc
cuu phan » cuu phat, cuu nhan, uu phan
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
cuu han » cuu nhan, cuu hoan, cuu hanh
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 tap, nghien ((cuu han) or (cuu phan)) hoc doanh khoa hoc xa hoi chung nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien ((cuu han) OR (cuu phan)) hoc doanh khoa hoc xa hoi chung nhan dan.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien ((cuu han) or (cuu phan)) hoc doanh khoa hoc xa hoi chung nhan dan*.