Perhaps you should try some spelling variations:
dinh tai » dinh toai, dinh tri, dinh thi
sach ly » sach lo, sach ty, sach hay
tai cua » thai cua, tai cuc, tri cua
va dinh » van dinh, va kinh, va tinh
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
cua tre » cua te, cuu tre, cua triet

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