Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
sach hoi » sach doi, sach moi, cach thoi
hoc phan » hoc pho
nhan tai » hang tai, van tai, toan tai
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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

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