Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tim lieu voi snippets" » "tim hieu voi snippets", "tai lieu voi snippets", "tri lieu voi snippets", "tim lieu boi snippets", "tim lieu va snippets", "tim lieu hoc 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: (((("tim lieu voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tim lieu voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tim lieu voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tim lieu voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.