Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
sac trong » tac trong, cay trong, hoc trong
trong tan » trong quan, trong cac, trong ca
thanh hoa » thanh pho
phat van » pham van, phan van, phap van
mot hoc » mon hoc, mo hoc, bot hoc
so sac » so sach, so dac
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 sac trong tan, nghien huu ((mot hoc) OR (mot goc)) thanh hoa hoc xa hoi va phat van~".
• Adding a wildcard symbol may retrieve word variants: so sac trong tan, nghien huu ((mot hoc) OR (mot goc)) thanh hoa hoc xa hoi va phat van*.