Perhaps you should try some spelling variations:
sach trong » sac trong, sach rong, sanh trong
nghien huy » nghien cuu, nguyen huy, nghiep quy
trong tan » trong quan, trong cac, trong ca
mot doanh » mot thanh, hoa doanh, voi doanh
thanh hoa » thanh pho
mot hoan » moc hoang, hop hoan, mot con
phat van » pham van, phan van, phap van
so sach » so sanh, bo sach, co sach
hoc xa » hoc ma

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach trong tan, nghien huy ((mot hoan) OR (mot doanh)) thanh hoa hoc xa hoi va phat van~".
• Adding a wildcard symbol may retrieve word variants: so sach trong tan, nghien huy ((mot hoan) OR (mot doanh)) thanh hoa hoc xa hoi va phat van*.