Perhaps you should try some spelling variations:
nghien cuc » nghien cuu, nghiep cuoc, nghiep cua
phan khoa » pham khoa, nhan khoa, phan hoa
danh nhan » doanh nhan, thanh nhan, benh nhan
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
hoc phan » hoc dan, hoc pho
khoa hoc » hoa hoc
van nhan » van phan, van thanh, van khanh
cuc mon » cac mon, cuc lon, cuc mien
mon hoc » toan hoc, dong hoc
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: thu sach hoc tap, nghien cuc mon hoc phan khoa hoc xa hoi ((van nhan) OR (danh nhan)) van~.
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuc mon hoc phan khoa hoc xa hoi ((van nhan) or (danh nhan)) van*.