Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
ty dang » ky dang, ty hang, ty dong
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
truc va » thuc va, thuc vat, trung va
ve cam » ve cham, ve cac, va cam
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: te sach ((ty dang) OR (ty xang)) xa hoi. hieu ve cam ((duc van) or (truc va)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty dang) OR (ty xang)) xa hoi. hieu ve cam ((duc van) OR (truc va)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty dang) OR (ty xang)) xa hoi. hieu ve cam ((duc van) or (truc va)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty dang) OR (ty xang)) xa hoi. hieu ve cam ((duc van) or (truc va)) hanh vi cua triet*.