Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
ve triet » su triet
va nhan » van nhan, va phan, va nha
duc van » duc va, duc tan, duc manh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. lieu ((va nhan) OR (ca nhan)) duc van hanh vi ((va trien) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. lieu ((va nhan) OR (ca nhan)) duc van hanh vi ((va trien) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. lieu ((va nhan) OR (ca nhan)) duc van hanh vi ((va trien) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. lieu ((va nhan) OR (ca nhan)) duc van hanh vi ((va trien) or (ve triet))*.