Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
sai ky » sac ky
ve cac » va cac, vien cac
cac co » cac cong
co van » cao van, vo van, so van
x hoi » xa hoi, x ho, 5 hoi
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: te ((sach ky) or (sai ky)) nang ((x hoi) OR (o hoi)). hieu ve cac co van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sai ky)) nang ((x hoi) OR (o hoi)). hieu ve cac co van hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sai ky)) nang ((x hoi) OR (o hoi)). hieu ve cac co van hanh vai cua triet*".