Perhaps you should try some spelling variations:
"hang cac chieu snippets" » "hang cac code snippets", "hang cac chien snippets", "hang cao hieu snippets", "hang cac che snippets", "hang ca chieu snippets", "hang cau chieu snippets", "bang cac chieu snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("hang cac chieu snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang cac chieu snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hang cac chieu snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hang cac chieu snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.