Perhaps you should try some spelling variations:
sach trong » sac trong, sach rong, sanh trong
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoan thanh » hoang thanh, ban thanh, van thanh
trong tan » trong quan, trong cac, trong ca
hoc thanh » hoc nhanh, hoc phan, ha thanh
phat van » pham van, phan van, phap van
so sach » so sanh, bo sach, co sach
huu mon » huu son, hau mon, huu mot
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 huu mon ((hoc thanh) OR (hoan thanh)) hoa hoc xa hoi va phat van~".
• Adding a wildcard symbol may retrieve word variants: so sach trong tan, nghien huu mon ((hoc thanh) OR (hoan thanh)) hoa hoc xa hoi va phat van*.