Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
khoa hoc » hoa hoc
cap phan » cac phan, cao phan, cap han
tu sach » thu sach, su sach, te sach
doi tai » hoi tai, dai tai, doi tac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ca phan » cac phan, cao phan, cau phan
hoc da » hoc dan, hoc dai, hoc dat
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: tu sach doi tai, nghien cuu mon hoc da khoa hoc xa hoi ((ca phan) OR (cap phan)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach doi tai, nghien cuu mon hoc da khoa hoc xa hoi ((ca phan) OR (cap phan)) van".
• Adding a wildcard symbol may retrieve word variants: tu sach doi tai, nghien cuu mon hoc da khoa hoc xa hoi ((ca phan) OR (cap phan)) van*.