Perhaps you should try some spelling variations:
lang hoi » lang hai, quang hoi, lang chai
cua tre » cua te, cuu tre, cua triet
hoi cua » hoi chuc
va lang » va nang, hoa lang
luc va » duc va, tuc va, loc va
bai ky » ban ky, bac ky, dai ky
nang o » nang co, nang ho, nang ro
sai ky » sac ky
va cao » va cac, va co, va dao
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 ((bai ky) OR (sai ky)) nang o hoi. hieu ((va cao) or (ca dao)) luc va lang hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((bai ky) OR (sai ky)) nang o hoi. hieu ((va cao) OR (ca dao)) luc va lang hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bai ky) OR (sai ky)) nang o hoi. hieu ((va cao) or (ca dao)) luc va lang hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((bai ky) OR (sai ky)) nang o hoi. hieu ((va cao) or (ca dao)) luc va lang hoi cua tre*.