Perhaps you should try some spelling variations:
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
xa hanh » xa thanh, xa khanh, va hanh
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
va cao » va cac, va co, va dao

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 ky ((lang xa) OR (dang xay)) hoi. hieu va cao tuc xa hanh ((vai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (dang xay)) hoi. hieu va cao tuc xa hanh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) OR (dang xay)) hoi. hieu va cao tuc xa hanh ((vai cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) OR (dang xay)) hoi. hieu va cao tuc xa hanh ((vai cua) or (lai cua)) tre*.