Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
sai cua » dai cua, lai cua, bai cua
xa danh » va danh, dia danh, nam danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
ky sang » ky nang, ky dang, ky tang
ve nam » he nam, va nam, le nam
thu xa » thu xac, thu ha, thu xe

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 sang ((mai hoi) OR (lai hoi)). hieu ve nam thu xa danh ((sai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((mai hoi) OR (lai hoi)). hieu ve nam thu xa danh ((sai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ((mai hoi) OR (lai hoi)). hieu ve nam thu xa danh ((sai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((mai hoi) OR (lai hoi)). hieu ve nam thu xa danh ((sai cua) or (hai cua)) tre*.