Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hai cua » thai cua, dai cua, hoi cua
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
su cao » cu cao, vu cao, su co
ma hoi » xa hoi, ma hoa, me hoi
su cam » su nam, su can, su lam
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((ma hoi) or (mai hoi)). hieu ((su cam) OR (su cao)) lo va thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((ma hoi) OR (mai hoi)). hieu ((su cam) OR (su cao)) lo va thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((ma hoi) or (mai hoi)). hieu ((su cam) OR (su cao)) lo va thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((ma hoi) or (mai hoi)). hieu ((su cam) OR (su cao)) lo va thanh hai cua tre*.