Perhaps you should try some spelling variations:
hang thuoc » khang thuoc, dang thuoc, hanh thuoc
sach doi » sach hoi, sach moi, sach dao
dong hoc » dong co, dong luc
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
mon hoc » toan hoc
va nhan » van nhan, ca nhan, va phan

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)) ngan hang thuoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu ((mon hoc) OR (dong hoc)) ngan hang thuoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu ((mon hoc) or (dong hoc)) ngan hang thuoc xa hoi va nhan dan*.