Perhaps you should try some spelling variations:
doanh tuong » doanh thuong, doanh tong, doanh trong
nghien cua » nghien cuu, nghiep cua, nghiep vua
tuong hoc » truong hoc, tuong ho, duong hoc
sach hoc » cach hoc, sach hoi, mach hoc
cong hoa » dong hoa, hang hoa
dong hoc » dong co, dong luc
nhan van » nhan dan, nhan va, phan van
tu sach » thu sach, su sach, te sach
hoc lai » hoc dai, hoc bai, hoc lam
lai hoi » dai hoi, lai hoa, lai roi
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cua ((cong hoa) OR (dong hoc)) doanh tuong hoc lai hoi va nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cua ((cong hoa) OR (dong hoc)) doanh tuong hoc lai hoi va nhan van".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cua ((cong hoa) OR (dong hoc)) doanh tuong hoc lai hoi va nhan van*.