Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai doi » moi doi, mai hoi, mai khoi
ky tang » ky nang, ky dang, kho tang
sai ky » sac ky
ve cac » va cac, vien cac
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky tang ((mai doi) or (lai hoi)). hieu ve cac duc va ((hanh vai) or (hanh va)) cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky tang ((mai doi) OR (lai hoi)). hieu ve cac duc va ((hanh vai) OR (hanh va)) cau triet.
• Adding a wildcard symbol may retrieve word variants: tu sai ky tang ((mai doi) or (lai hoi)). hieu ve cac duc va ((hanh vai) or (hanh va)) cau triet*.