Perhaps you should try some spelling variations:
sach nguyen » hoach nguyen, quach nguyen, sach luyen
nguyen tri » nguyen thi, nguyen tai, nguyen thai
tuan tai » toan tai, quan tai, tan tai
lang tri » quang tri, trang tri, lang thai
nang tri » nang tai, nang thi, quang tri
so sach » so sanh, bo sach, co sach
su anh » sua anh, vu anh, tu anh

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 tuan tai ) or ( quy hoach ((lang tri) OR (nang tri)) ))) or ( so sach nguyen tri ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( su anh tuan tai ) OR ( quy hoach ((lang tri) OR (nang tri)) ))) OR ( so sach nguyen tri )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( su anh tuan tai ) or ( quy hoach ((lang tri) OR (nang tri)) ))) or ( so sach nguyen tri ))".
• Adding a wildcard symbol may retrieve word variants: (((( su anh tuan tai ) or ( quy hoach ((lang tri) OR (nang tri)) ))) or ( so sach nguyen tri ))*.