Perhaps you should try some spelling variations:
"toc sach thanh tri" » "toc sach tranh tri", "toc sach tham tri", "toc danh thanh tri", "toc sach thanh tra", "toc sach thanh tai", "toc sach chinh tri", "hoc sach thanh tri", "doc sach thanh tri", "thuoc sach thanh tri"
"te sach nang thi" » "te cach mang thi", "te sach dung thi", "te sach danh thi", "te sach dang thi", "te sach tang thi", "te sach nang tai"
"te san quan tri" » "te van quan tri", "te ban quan tri", "te dan quan tri", "ke san quan tri", "tu san 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: (("te san quan tri") or ((("te sach nang thi") or ("toc sach thanh tri"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te san quan tri") OR ((("te sach nang thi") OR ("toc sach thanh tri")))).
• Removing quotes may allow a broader search: (( te san quan tri ) or ((( te sach nang thi ) or ( toc sach thanh tri )))).
• Adding a wildcard symbol may retrieve word variants: (("te san quan tri") or ((("te sach nang thi") or ("toc sach thanh tri"))))*.