Perhaps you should try some spelling variations:
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
xay hoi » xa hoi, tay hoi, cay phoi
sach 2 » sach y
2 dang » 2 danh, _ dang, b dang
cam tu » cam thu, nam tu, dam tu
vi va » vi van, vai va, vu va

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 2 dang xay hoi. lieu va ((cam tu) or (nam thuc)) van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach 2 dang xay hoi. lieu va ((cam tu) OR (nam thuc)) van hanh vi va triet*.