Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoi » sach doi, cach thoi, hoach hoi
sach moi » sach doi, bach mai, sach bai
phan dau » phan tu, hang dau
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
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: nuoc ((sach hoi) OR (sach moi)) tap, nghien cuu mon hoc doanh hoa hoc xa hoi va phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc ((sach hoi) OR (sach moi)) tap, nghien cuu mon hoc doanh hoa hoc xa hoi va phan dau".
• Adding a wildcard symbol may retrieve word variants: nuoc ((sach hoi) OR (sach moi)) tap, nghien cuu mon hoc doanh hoa hoc xa hoi va phan dau*.