Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
cac toc » cac toi, cac thoi
so dac » so dan
dac ky » cac ky, dan ky, sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so dac ky nang x ho. hieu vien ((cac toc) or (cac nuoc)) ban hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dac ky nang x ho. hieu vien ((cac toc) OR (cac nuoc)) ban hanh vi ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: so dac ky nang x ho. hieu vien ((cac toc) or (cac nuoc)) ban hanh vi ((cua triet) or (cua viet))*.