Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien huu » nghien cuu, nguyen huu, nhiem huu
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
thanh van » thanh san, thanh toan, thanh phan
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
xa thanh » va thanh, ha thanh, ta thanh
nhan dan » phan dau, gian dan, nhan tai
nhan va » nhan tai, nhan tao, phan van
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: thuoc sach hoc tap, nghien huu co hoc doanh khoa hoc xa thanh van ((nhan va) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach hoc tap, nghien huu co hoc doanh khoa hoc xa thanh van ((nhan va) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach hoc tap, nghien huu co hoc doanh khoa hoc xa thanh van ((nhan va) or (nhan dan))*.