Perhaps you should try some spelling variations:
dang xay » dang van, van xay
dinh thi » dinh tri
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » hieu qua
thi cua » thai cua, thi cuc, tri cua
loc va » luc va
cua tu » cua tuc, cua su, cua cu

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

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