Perhaps you should try some spelling variations:
ly quang » le quang, vu quang
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
ca tinh » cua tinh, cac tinh, va tinh
xa tinh » va tinh, ha tinh, xa sinh
hieu va » lieu va, hieu qua
lo hang » ly hang, le hang, cho hang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((lo hang) or (ly quang)) va hoi. hieu va cam tu ((xa tinh) OR (ca tinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((lo hang) OR (ly quang)) va hoi. hieu va cam tu ((xa tinh) OR (ca tinh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((lo hang) or (ly quang)) va hoi. hieu va cam tu ((xa tinh) OR (ca tinh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((lo hang) or (ly quang)) va hoi. hieu va cam tu ((xa tinh) OR (ca tinh)) vai cua tre*.