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
le danh » le dinh, le anh, le manh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
ve nam » he nam, va nam, le nam
nam tu » nam thu, nam thuc
ma hoi » xa hoi, ma hoa, me hoi
tu le » vu le, tu te

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 ((ma hoi) or (mai hoi)). hieu ve nam tu le danh ((sai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((ma hoi) OR (mai hoi)). hieu ve nam tu le danh ((sai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((ma hoi) or (mai hoi)). hieu ve nam tu le danh ((sai cua) or (hai cua)) tre*.