Perhaps you should try some spelling variations:
khoa doanh » hoa doanh, cho doanh, khoa dang
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
va phan » van phan, va phat, va phap
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: te ((sach hoc) OR (mach hoc)) tap, nghien cuu toan khoa doanh khoa hoc xa hoi va phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach hoc) OR (mach hoc)) tap, nghien cuu toan khoa doanh khoa hoc xa hoi va phan dau".
• Adding a wildcard symbol may retrieve word variants: te ((sach hoc) OR (mach hoc)) tap, nghien cuu toan khoa doanh khoa hoc xa hoi va phan dau*.