Perhaps you should try some spelling variations:
"ho chu trinh." » "ho chu tich." (Expand Search), "ho chu trong." (Expand Search), "hoi chu trinh." (Expand Search), "tho chu trinh." (Expand Search)
"ho chuong trinh." » "hoc chuong trinh." (Expand Search), "hoa chuong trinh." (Expand Search), "hoi chuong trinh." (Expand Search), "tho chuong trinh." (Expand Search)
"ho chu tinh." » "ho chau tinh." (Expand Search), "ho chua tinh." (Expand Search), "ho chuc tinh." (Expand Search), "hoi chu tinh." (Expand Search), "tho chu tinh." (Expand Search)
"ho chi tinh." » "ho chi minh." (Expand Search), "ho moi tinh." (Expand Search), "ho vi tinh." (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: (((("ho chu tinh.") OR ("ho chi tinh."))) OR ((("ho chu trinh.") OR ("ho chuong trinh."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ho chu tinh.\") OR (\"ho chi tinh.\"))) OR (((\"ho chu trinh.\") OR (\"ho chuong trinh.\"))))".
• Removing quotes may allow a broader search: (((( ho chu tinh. ) OR ( ho chi tinh. ))) OR ((( ho chu trinh. ) OR ( ho chuong trinh. )))).
• Adding a wildcard symbol may retrieve word variants: (((("ho chu tinh.") OR ("ho chi tinh."))) OR ((("ho chu trinh.") OR ("ho chuong trinh."))))*.