Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
su triet » su viet, su tien, ve triet
hieu ve » hieu va
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dai su » dai sua, dai so, dan su
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu van)) am thuc va danh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((x hoi) OR (o hoi)). ((hieu ve) OR (hieu van)) am thuc va danh dai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu van)) am thuc va danh dai su triet".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((x hoi) OR (o hoi)). ((hieu ve) or (hieu van)) am thuc va danh dai su triet*.