Perhaps you should try some spelling variations:
dohang khoa » doanh khoa, dong khoa, dang khoa
nghien huu » nghien cuu, nguyen huu, nhiem huu
hang khoa » dung khoa
sach hoi » sach doi, sach moi, cach thoi
mot cach » loi cach
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
huu mot » cuu mot, huy mot, hieu mot
va phan » van phan, va phat, va phap
hoc xa » hoc ma

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 hoi tap, nghien huu mot cach ((hang khoa) or (dohang khoa)) hoc xa hoi va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien huu mot cach ((hang khoa) OR (dohang khoa)) hoc xa hoi va phan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien huu mot cach ((hang khoa) or (dohang khoa)) hoc xa hoi va phan van*.