Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
xa dinh » xac dinh, va dinh, ha dinh
ba dinh » va dinh, xac dinh, nam dinh
tai cua » thai cua, tai cuc, dai cua
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ly hang xa hoi. hieu ve cac tuc ((xa dinh) or (ba dinh)) ((tai cua) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ly hang xa hoi. hieu ve cac tuc ((xa dinh) OR (ba dinh)) ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ly hang xa hoi. hieu ve cac tuc ((xa dinh) or (ba dinh)) ((tai cua) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: co sach ly hang xa hoi. hieu ve cac tuc ((xa dinh) or (ba dinh)) ((tai cua) OR (tri cua)) tre*.