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