Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va trien » va truyen, va thiet, va tuyen
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
ky lang » ky nang, ky dang, ky tang
co dan » co ban, ca dan, cao dang
cu dan » cua dan, ca dan, cuoi dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((cu dan) OR (co dan)) ky lang van hoa. hieu van cam duc van hanh di ((va trien) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cu dan) OR (co dan)) ky lang van hoa. hieu van cam duc van hanh di ((va trien) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cu dan) OR (co dan)) ky lang van hoa. hieu van cam duc van hanh di ((va trien) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: ((cu dan) OR (co dan)) ky lang van hoa. hieu van cam duc van hanh di ((va trien) or (cua viet))*.