Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, ve triet
thu xac » thau xay
danh vi » hanh vi, dinh vi, danh di
su tien » su kien, su hien, tu tieng
van dau » van dao, phan dau
cao hoi » cau hoi, co hoi, cao hoc
xac ky » cac ky, sac ky, bac ky
xua va » xuat va, sua va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu xac ky nang cao hoi. hieu van dau ((xua va) or (vua va)) danh vi ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky nang cao hoi. hieu van dau ((xua va) OR (vua va)) danh vi ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu xac ky nang cao hoi. hieu van dau ((xua va) or (vua va)) danh vi ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: thu xac ky nang cao hoi. hieu van dau ((xua va) or (vua va)) danh vi ((su triet) OR (su tien))*.