Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
vu khach » vu khanh, vu khac, vay khach
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
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: ((vu khach) or (tu sach)) hoc tap, nghien cuu dong hoc doanh hoa hoc xa hoi va nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (tu sach)) hoc tap, nghien cuu dong hoc doanh hoa hoc xa hoi va nhan va.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (tu sach)) hoc tap, nghien cuu dong hoc doanh hoa hoc xa hoi va nhan va*.