Perhaps you should try some spelling variations:
nang cuu » nang cau, nang cua, nang chiu
ban hanh » ban hang
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
hieu va » lieu va
cuu ban » cuu van, cua ban, cuu san
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. ((hieu va) or (hieu qua)) nang cuu ban hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. ((hieu va) OR (hieu qua)) nang cuu ban hanh vi ((va trien) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu va) or (hieu qua)) nang cuu ban hanh vi ((va trien) or (su triet))*.