Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
so sang » so sanh, so dang, so lang
sang ky » sang kyo, dang ky, tang ky
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
va dinh » van dinh, va kinh, va tinh
ky van » ly van, ty van, ky 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 sang ky van xay hoi. hieu va cac duc ((va hanh) or (va dinh)) di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ky van xay hoi. hieu va cac duc ((va hanh) OR (va dinh)) di ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: so sang ky van xay hoi. hieu va cac duc ((va hanh) or (va dinh)) di ((cua triet) or (va triet))*.