Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
mang mai » mang may, lang mai, mang lai
tinh hai » tinh thai, tinh chat, trinh han
sach ty » sach y, sach tu, sach thu
hai cua » thai cua, dai cua, hoi cua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
cham lo » cham o, cam lo, cham hoi
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty mang » ty xang, ty hang, tin mang
nam lo » nam bo, nam so, nam co

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 ty mang mai hoi. hieu ve ((((cham lo) or (cham soc))) or (nam lo)) va tinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty mang mai hoi. hieu ve ((((cham lo) OR (cham soc))) OR (nam lo)) va tinh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty mang mai hoi. hieu ve ((((cham lo) or (cham soc))) or (nam lo)) va tinh hai cua tre*.