Perhaps you should try some spelling variations:
"bo sach thanh tri" » "bo sach tranh tri", "bo sach tham tri", "bo danh thanh tri", "bo sach thanh tai", "bo sach chinh tri", "bo sach thanh hai", "co sach thanh tri", "hoc sach thanh tri"
"bo sach thanh tra" » "bo sach tranh tra", "bo sach tham tra", "bo danh thanh tra", "bo sach thanh toan", "bo sach thanh hoa", "co sach thanh tra", "hoc sach thanh tra"
"su anh quan tri" » "su anh tuan tri", "su ban quan tri", "su anh nhan tri", "sua anh quan tri", "vu anh quan tri", "tu anh quan tri"

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: (("su anh quan tri") or ((("bo sach thanh tri") OR ("bo sach thanh tra"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su anh quan tri") OR ((("bo sach thanh tri") OR ("bo sach thanh tra")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"su anh quan tri\") or (((\"bo sach thanh tri\") OR (\"bo sach thanh tra\"))))".
• Removing quotes may allow a broader search: (( su anh quan tri ) or ((( bo sach thanh tri ) OR ( bo sach thanh tra )))).
• Adding a wildcard symbol may retrieve word variants: (("su anh quan tri") or ((("bo sach thanh tri") OR ("bo sach thanh tra"))))*.