Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
duc phan » dung phan, duc thang, duc phung
duc manh » suc manh, duc anh, duc minh
so sach » so sanh, bo sach, co sach
nang ro » nang co, nang ho, nang ra
nang o » nang co, nang ho, nang x
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: so sach y ((nang o) OR (nang ro)) hoi. hieu van cham ((duc phan) or (duc manh)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang o) OR (nang ro)) hoi. hieu van cham ((duc phan) OR (duc manh)) hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((nang o) OR (nang ro)) hoi. hieu van cham ((duc phan) or (duc manh)) hanh vi cua triet*".