Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
khoa hoc » hoa hoc
cua gian » cua giang, cua giao, cua gia
gian dan » gian lang
tu sach » thu sach, su sach, te sach
hoi tap » hoc tap, hoi tai, hai tap
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cua » hoi chuc
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) or (hoi dap)), nghien cuu mon hoc doanh khoa hoc xa hoi cua gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((hoi tap) OR (hoi dap)), nghien cuu mon hoc doanh khoa hoc xa hoi cua gian dan.
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoi tap) or (hoi dap)), nghien cuu mon hoc doanh khoa hoc xa hoi cua gian dan*.