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 manh » suc manh, duc anh, duc minh
sach ky » sach y, sach ty, sach kem
duc van » duc va, duc tan, duc phan
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
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: su ((sach ky) OR (sac ky)) nang o hoi. hieu van cham ((duc van) or (duc manh)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang o hoi. hieu van cham ((duc van) OR (duc manh)) hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang o hoi. hieu van cham ((duc van) or (duc manh)) hanh vi cua triet*".