Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
su sac » su sach, su cac, su xac
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky lang) or (ky nang)) ha noi. hieu ve cac duc va hanh lam ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky nang)) ha noi. hieu ve cac duc va hanh lam ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky nang)) ha noi. hieu ve cac duc va hanh lam ((cua triet) or (va triet))*.