Perhaps you should try some spelling variations:
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
xa hanh » xa thanh, xa khanh, va hanh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
can ky » van ky, ban ky, tan ky
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
dan ky » van ky
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 ((can ky) OR (dan ky)) nang o hoi. hieu ve cac tuc xa hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (dan ky)) nang o hoi. hieu ve cac tuc xa hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((can ky) OR (dan ky)) nang o hoi. hieu ve cac tuc xa hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) OR (dan ky)) nang o hoi. hieu ve cac tuc xa hanh ((vai cua) or (hai cua)) tre*.