Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
khoa doanh » hoa doanh, cho doanh, khoa dang
doanh hoan » doanh doanh, doanh khoa, doanh nhan
thu sach » tu sach, thuat sach, thu hoach
cuu toan » cuu hoan, cua toan, huu toan
hoan hoc » hoa hoc, toan hoc, hoang hoa
nhan dan » phan dau, gian dan, nhan tai
va nhan » van nhan, ca nhan, va phan
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: ((thu sach) or (thuoc sach)) hoc tap, nghien cuu toan khoa doanh hoan hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) hoc tap, nghien cuu toan khoa doanh hoan hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) hoc tap, nghien cuu toan khoa doanh hoan hoc xa hoi va nhan dan*.