Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va
cac toc » cac toi, cac nuoc, cac thoi
via cua » gia cua, gian cua, giau cua
y xang » ty xang
toc va » hoc va, toc ta, tuc va
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y xang xa hoi. ((hieu va) OR (hieu qua)) cac toc va thanh ((via cua) or (ca cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y xang xa hoi. ((hieu va) OR (hieu qua)) cac toc va thanh ((via cua) OR (ca cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y xang xa hoi. ((hieu va) OR (hieu qua)) cac toc va thanh ((via cua) or (ca cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach y xang xa hoi. ((hieu va) OR (hieu qua)) cac toc va thanh ((via cua) or (ca cua)) te*.