Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
qua than » qua thanh, qua phan, qua tan
than soc » than doc, than hoc, than so
dien cuu » dien cuc, dien cu, dien cua
sach va » sach xa, sach ha, sach dao
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
sach v » sach y, sach 2, sach vay
soc va » hoc va, loc va, doc va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) or (sach va)) nang x hoi. hieu qua than soc va danh dien cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach va)) nang x hoi. hieu qua than soc va danh dien cuu tre*.