Perhaps you should try some spelling variations:
lang hai » lang chai, lang thai, lang ha
hai cua » thai cua, dai cua, hoi cua
va lang » va nang, hoa lang
tu bai » tu ban, tu bat, te bai
va dao » ca dao
luc va » duc va, tuc va, loc va
cua te » cua tu
bai ky » ban ky, sai ky, bac ky
va cao » va cac, va co, va bao
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky nang ((o hoi) OR (co hoi)). hieu ((va cao) or (va dao)) luc va lang hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang ((o hoi) OR (co hoi)). hieu ((va cao) OR (va dao)) luc va lang hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky nang ((o hoi) OR (co hoi)). hieu ((va cao) or (va dao)) luc va lang hai cua te".
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang ((o hoi) OR (co hoi)). hieu ((va cao) or (va dao)) luc va lang hai cua te*.