Perhaps you should try some spelling variations:
nganh dang » ngan hang, nhan dang, nganh cong
dang thuoc » dung thuoc
sach doi » sach hoi, sach moi, sach dao
dong hoc » dong co, dong luc
thuoc xa » thuoc ma, thuoc va, thuoc la
phan dau » phan tu, hang dau
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
mon hoc » toan hoc
va phan » van phan, va phat, va phap

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach doi tap, nghien cuu ((mon hoc) or (dong hoc)) nganh dang thuoc xa hoi va phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu ((mon hoc) OR (dong hoc)) nganh dang thuoc xa hoi va phan dau.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu ((mon hoc) or (dong hoc)) nganh dang thuoc xa hoi va phan dau*.