Perhaps you should try some spelling variations:
"phap trien cua hoi." » "pha trien cua hoi." (Expand Search), "phan trien cua hoi." (Expand Search), "phap tien cua hoi." (Expand Search), "phap trien cua thoi." (Expand Search), "phap trien cua ho." (Expand Search), "phap trien cua hoc." (Expand Search)
"phat trien cua hoi." » "phat trien cua thoi." (Expand Search), "phat trien cua ho." (Expand Search), "phat trien cua hoc." (Expand Search)
"phat trien du hoi." » "phat trien dau hoi." (Expand Search), "phat trien duc hoi." (Expand Search), "phat trien su hoi." (Expand Search)

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: (((("phat trien cua hoi.") OR ("phat trien du hoi."))) OR ("phap trien cua hoi."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"phat trien cua hoi.\") OR (\"phat trien du hoi.\"))) OR (\"phap trien cua hoi.\"))".
• Removing quotes may allow a broader search: (((( phat trien cua hoi. ) OR ( phat trien du hoi. ))) OR ( phap trien cua hoi. )).
• Adding a wildcard symbol may retrieve word variants: (((("phat trien cua hoi.") OR ("phat trien du hoi."))) OR ("phap trien cua hoi."))*.