Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc nganh » hoc nhanh
nganh hoa » thanh hoa, khanh hoa, danh hoa
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoi » sach doi, sach moi, cach thoi
cong hoc » dong hoc, cong hoa, cong coc
hoi danh » hop danh, hoi dan, hoc danh
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai

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 thu cong hoc nganh hoa ((hoc xa) or (hoc ma)) hoi danh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien thu cong hoc nganh hoa ((hoc xa) OR (hoc ma)) hoi danh nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien thu cong hoc nganh hoa ((hoc xa) or (hoc ma)) hoi danh nhan dan*.