Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
toc sach » hoc sach, doc sach, thuoc sach
sach dao » lanh dao
cuu hoan » luu hoang, cuu van, cuu khoa
hoan hoc » toan hoc, hoang hoa, khoan hoi
nhan dan » phan dau, gian dan, nhan tai
dao tap » dao tao, dao tay, dao gap
hoi cua » hoi chuc
hoc xa » hoc ma
hoi ca » hoi cac, hoi cau, hoi va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach dao tap, nghien cuu hoan hoc doanh hoa hoc xa ((hoi ca) or (hoi cua)) nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach dao tap, nghien cuu hoan hoc doanh hoa hoc xa ((hoi ca) OR (hoi cua)) nhan dan.
• Adding a wildcard symbol may retrieve word variants: toc sach dao tap, nghien cuu hoan hoc doanh hoa hoc xa ((hoi ca) or (hoi cua)) nhan dan*.