Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
va hanh » van hanh, va thanh, ban hanh
van cam » van nam, van lam, van dam
va danh » va dinh, va dan, dia danh
van cau » van dau, van hau, van chat
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac 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: su xac ky nang o hoi. hieu ((van cam) OR (van cau)) xuc ((va hanh) or (va danh)) thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang o hoi. hieu ((van cam) OR (van cau)) xuc ((va hanh) OR (va danh)) thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang o hoi. hieu ((van cam) OR (van cau)) xuc ((va hanh) or (va danh)) thai cua te".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang o hoi. hieu ((van cam) OR (van cau)) xuc ((va hanh) or (va danh)) thai cua te*.