Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dao hieu moi snippets" » "cao hieu moi snippets", "van hieu moi snippets", "bao hiem moi snippets", "dao nhiem moi snippets", "dao hieu so snippets", "dao hieu bo snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dao hieu moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dao hieu moi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dao hieu moi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dao hieu moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.