Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, don thuoc
phan dong » phan cong, phan dang, phan hong
thu sach » tu sach, thuat sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
hoc phan » hoc dan, hoc pho
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan van » nhan dan, nhan va, phan van
doi tai » hoi tai, dai tai, doi tac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cua » hoi chuc
hoi ca » hoi cac, hoi cau, hoi va

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

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