Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
mach phan » cach pha, dich phan, sach phat
mach hai » manh hai, mach vi, sach han
so sach » so sanh, bo sach, co sach
ky dang » ky danh
xay hoi » xa hoi, tay hoi, cay phoi
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) OR (ky nang)) xay hoi. lieu va 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) OR (ky nang)) xay hoi. lieu va cac dan ban ((mach hai) OR (mach phan)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ky dang) OR (ky nang)) xay hoi. lieu va cac dan ban ((mach hai) or (mach phan)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dang) OR (ky nang)) xay hoi. lieu va cac dan ban ((mach hai) or (mach phan)) cua triet*.