Perhaps you should try some spelling variations:
may trinh » may tinh, lap trinh, quy trinh
trinh di » trinh do, trinh dien, trinh dinh
sang ky » sang kyo, dang ky, tang ky
xuc may » xuc hay, truc may, phuc may
di cua » dai cua, doi cua, de cua
va cam » va cham, va cao, va cai
san ky » van ky, dan ky, ban ky
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) or (sang ky)) nang o hoi. hieu ((va cam) or (va cac)) xuc may trinh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) nang o hoi. hieu ((va cam) OR (va cac)) xuc may trinh di cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (sang ky)) nang o hoi. hieu ((va cam) or (va cac)) xuc may trinh di cua te*.