Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh hai » tinh thai, tinh chat, trinh han
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va tinh » may tinh
hai cua » thai cua, dai cua, hoi cua
su sac » su sach, su cac, su xac

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

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