Perhaps you should try some spelling variations:
phan dong » phan cong, phan dang, phan hong
sach doi » sach hoi, sach moi, sach dao
cac cong » cua cong
hoc phan » hoc dan, hoc pho
dong hoc » dong co, dong luc
dan chan » dan gian, dan ca, van chat
chan van » chuan van, phan van, nhan van
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
hoi dan » hoa dan, hoc dan, hoi dap
hoc xa » hoc ma

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien ((cuu mo) OR (cac cong)) hoc phan dong hoc xa hoi dan chan van~.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien ((cuu mo) or (cac cong)) hoc phan dong hoc xa hoi dan chan van*.