Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc nganh
sach hoi » sach doi, sach moi, cach thoi
cuu toan » cuu hoan, cua toan, huu toan
van nhan » van phan, van thanh, danh nhan
so sach » so sanh, bo sach, co sach
hoi van » hoi va, hoi dan, hai van
nhan va » nhan tai, nhan dan, nhan tao
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: so sach hoi dap, nghien cuu toan ((hoc doanh) OR (hoc dan)) hoa hoc xa hoi van nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoi dap, nghien cuu toan ((hoc doanh) OR (hoc dan)) hoa hoc xa hoi van nhan va".
• Adding a wildcard symbol may retrieve word variants: so sach hoi dap, nghien cuu toan ((hoc doanh) OR (hoc dan)) hoa hoc xa hoi van nhan va*.