Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
tu sach » thu sach, su sach, te sach
sai cua » dai cua, hai cua, lai cua
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
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
thu xa » thu xac, thu xe, thu ba
ma hoi » xa hoi, ma hoa, me hoi

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 ((thu xa) or (thu ha)) danh sai 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 ((thu xa) OR (thu ha)) danh sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ((ma hoi) OR (mai hoi)). hieu ve nam ((thu xa) or (thu ha)) danh sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((ma hoi) OR (mai hoi)). hieu ve nam ((thu xa) or (thu ha)) danh sai cua tre*.