Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
sach dao » lanh dao
cuu dong » cuu cong, cuu tong, cuu long
co doanh » cho doanh, cao doanh, so doanh
hoan hoc » hoa hoc, toan hoc, hoang hoa
hoa phan » hoa dan, co phan
nhan van » nhan va, phan van, nha van
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
dao dap » dao dan, dao gap, do dap
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa

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 dao dap, nghien cuu dong co doanh hoan hoc xa hoa phan ((nhan van) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dao dap, nghien cuu dong co doanh hoan hoc xa hoa phan ((nhan van) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: su sach dao dap, nghien cuu dong co doanh hoan hoc xa hoa phan ((nhan van) or (nhan dan))*.