Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
thu sac » thu sach, thu san, thu xac
mai hoi » mai khoi, dai hoi, lai hoi
van dau » van dao, phan dau
sac ky » cac ky, sai ky
xua va » xuat va, sua va
ma hoi » xa hoi, ma hoa, me hoi
vi cua » vai cua, di cua

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

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