Perhaps you should try some spelling variations:
goc doanh » hoa doanh, voi doanh, von doanh
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
phan van » pham van, thanh van, luan van
cuu mot » cua mot, cuu mo, huu 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: su ((sach hoc) OR (cach hoc)) tap, nghien cuu mot goc doanh hoa hoc ma hoa va phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach hoc) OR (cach hoc)) tap, nghien cuu mot goc doanh hoa hoc ma hoa va phan van".
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) OR (cach hoc)) tap, nghien cuu mot goc doanh hoa hoc ma hoa va phan van*.