Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi quen voi snippets" » "thoi quen voi snippets", "thi quan voi snippets", "thi huyen voi snippets", "thi dien voi snippets", "thi que vo 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: (((("thi quen 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: (((("thi quen voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi quen voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi quen voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.