Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
phan dan » phan dang, nhan dan, phan van
phan dau » phan tu, hang dau
mo hoc » mon hoc, co hoc
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 hoc tap, nghien cuu mo hoc doanh khoa hoc xa hoi va ((phan dan) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu mo hoc doanh khoa hoc xa hoi va ((phan dan) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu mo hoc doanh khoa hoc xa hoi va ((phan dan) or (phan dau))*.