Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach doi » sach hoi, sach moi, sach dao
van nhan » van phan, van thanh, danh nhan
su sach » so sach, vu sach
doi tap » doi tac, doi dap, doi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong 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 doi tap, nghien cuu mon hoc doanh hoa hoc xa hoi ((ca nhan) or (van nhan)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach doi tap, nghien cuu mon hoc doanh hoa hoc xa hoi ((ca nhan) OR (van nhan)) tai.
• Adding a wildcard symbol may retrieve word variants: su sach doi tap, nghien cuu mon hoc doanh hoa hoc xa hoi ((ca nhan) or (van nhan)) tai*.