Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu cua » dieu cua, bieu cua, hieu ca
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
tai cao » thai cao, tao cao, tai sao
cac ly » cac ky, cac le, cam ly
tai ca » tai cac, tai cua, bai ca

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

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