Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
mach hoi » sach hoi, mach hoc, cach thoi
ban mach » ban sach, ranh mach, ban hanh
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
hoi cua » hoi chuc
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
su sach » vu sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
hieu ve » hieu van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ky dang xay hoi. ((hieu ve) or (hieu va)) cac duc ban mach hoi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xay hoi. ((hieu ve) OR (hieu va)) cac duc ban mach hoi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky dang xay hoi. ((hieu ve) or (hieu va)) cac duc ban mach hoi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky dang xay hoi. ((hieu ve) or (hieu va)) cac duc ban mach hoi cua triet*.