Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
doanh hoa » doanh khoa, danh hoa, doanh ha
gian lang » gian dan
sach moi » sach doi, sach hoi, bach mai
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
tu sach » thu sach, su sach, te sach
moi dap » hoi dap, doi dap, moi dan
va gian » va gianh, van gian, va giai
hoc xa » hoc ma

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach moi dap, nghien cuu dong hoc ((doanh hoa) OR (doanh hoan)) hoc xa hoi va gian lang~.
• Adding a wildcard symbol may retrieve word variants: tu sach moi dap, nghien cuu dong hoc ((doanh hoa) or (doanh hoan)) hoc xa hoi va gian lang*.