Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
khoa hoc » hoa hoc
phan dan » phan dang, phan dau, nhan dan
va phan » van phan, va phat, va phap
mo hoc » mon hoc, co hoc
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) OR (sach hoi)) tap, nghien cuu mo hoc doanh khoa hoc xa hoi va phan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach hoc) OR (sach hoi)) tap, nghien cuu mo hoc doanh khoa hoc xa hoi va phan dan".
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) OR (sach hoi)) tap, nghien cuu mo hoc doanh khoa hoc xa hoi va phan dan*.