Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh hoan » doanh doanh, doanh khoa, doanh nhan
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoi » sach doi, sach moi, cach thoi
cua dong » chua dong, cua cong, cua dang
dong hoc » dong co, dong luc
hoan hoc » hoa hoc, toan hoc, hoang hoa
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
hai van » thai van, hai tan, hao van
hoc xa » hoc ma
ha van » hoa van, nha van, va van
toan » tran

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 hoi tai, nghien cua dong hoc doanh hoan hoc xa ((hai van) OR (ha van)) tinh toan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tai, nghien cua dong hoc doanh hoan hoc xa ((hai van) OR (ha van)) tinh toan".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tai, nghien cua dong hoc doanh hoan hoc xa ((hai van) OR (ha van)) tinh toan*.