Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
va bac » van bac, va cac, va bai
bac vo » bac bo, bac ho, bac va
x hoi » o hoi, x ho, 5 hoi

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 nang ((x hoi) or (xa hoi)). hieu va bac vo van hanh dai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((x hoi) OR (xa hoi)). hieu va bac vo van hanh dai ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((x hoi) or (xa hoi)). hieu va bac vo van hanh dai ((cua triet) or (va triet))*.