Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
gian lang » gian dan
cuu long » cuu cong, cuu tong, cuu nang
long hoc » dong hoc, long soc, long thuoc
tu cach » tu cac
su sach » so sach, vu sach
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 cach) OR (su sach)) hoi dap, nghien cuu long hoc doanh hoa hoc xa hoi va gian lang~.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) hoi dap, nghien cuu long hoc doanh hoa hoc xa hoi va gian lang*.