Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
doanh ha » doanh va, doanh khoa, doanh nhan
danh hoa » thanh hoa, khanh hoa, nganh hoa
phan van » pham van, thanh van, luan van
so sach » so sanh, bo sach, co sach
huu mot » cuu mot, huy mot, hieu mot
va phan » van phan, va phat, va phap
hoa va » hoa van, hoa xa, hoa vo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nhiem huu mot goc ((doanh ha) or (danh hoa)) hoc ma hoa va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nhiem huu mot goc ((doanh ha) OR (danh hoa)) hoc ma hoa va phan van.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nhiem huu mot goc ((doanh ha) or (danh hoa)) hoc ma hoa va phan van*.