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 doi » sach hoi, sach moi, sach dao
mot cach » loi cach
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi 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 doi 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 doi 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 doi tap, nghien huu mot cach ((hang khoa) or (dohang khoa)) hoc xa hoi va phan van*.