Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dinh thi » dinh tri
dang xay » dang van, van xay
tu sach » su sach, te sach, tu cach
cac dac » cac dan, cac dai, cac bac
thi cua » thai cua, thi cuc, tri cua
va dinh » van dinh, va kinh, va tinh
cac tuc » cac toc, cac tu, cac tac
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) y dang xay hoi. lieu va ((cac tuc) or (cac dac)) va dinh thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y dang xay hoi. lieu va ((cac tuc) OR (cac dac)) va dinh thi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y dang xay hoi. lieu va ((cac tuc) or (cac dac)) va dinh thi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y dang xay hoi. lieu va ((cac tuc) or (cac dac)) va dinh thi cua tre*.