Perhaps you should try some spelling variations:
mach phan » cach pha, dich phan, sach phat
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
mach hai » manh hai, mach vi, sach han
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
van cac » van hac, van cau, van bac
dan ban » van ban, can ban, dan ba

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 ky dang xay hoi. hieu van cac dan ban ((mach hai) or (mach phan)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xay hoi. hieu van cac dan ban ((mach hai) OR (mach phan)) cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xay hoi. hieu van cac dan ban ((mach hai) or (mach phan)) cua triet*.