Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
sach moi » sach doi, sach hoi, bach mai
so sach » so sanh, bo sach, co sach
moi dap » hoi dap, doi dap, moi dan
cuu mot » cua mot, cuu mo, huu mot
mot van » mot vai, moi van, mot lan
va pham » van pham, 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 moi dap, nghien cuu mot van doanh ((khoa hoc) OR (hoa hoc)) ma hoa va pham van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach moi dap, nghien cuu mot van doanh ((khoa hoc) OR (hoa hoc)) ma hoa va pham van".
• Adding a wildcard symbol may retrieve word variants: so sach moi dap, nghien cuu mot van doanh ((khoa hoc) OR (hoa hoc)) ma hoa va pham van*.