Perhaps you should try some spelling variations:
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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: (("phap trien nang khieu cua ban than.") OR ("phap trien van hieu cua ban than."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"phap trien nang khieu cua ban than.\") OR (\"phap trien van hieu cua ban than.\"))".
• Removing quotes may allow a broader search: (( phap trien nang khieu cua ban than. ) OR ( phap trien van hieu cua ban than. )).
• Adding a wildcard symbol may retrieve word variants: (("phap trien nang khieu cua ban than.") OR ("phap trien van hieu cua ban than."))*.