Perhaps you should try some spelling variations:
bat thanh » ban thanh, bac thanh, dat thanh
nay quang » tay quang, vay quang, nhat quang
thanh tai » thanh hai, thanh toan, doanh tai
sach nay » sach hay, sach vay, sach nang
quang ma » xquang ma, quang va, quang manh
so sach » so sanh, bo sach, co sach
hieu va » lieu va
luc bat » suc bat, luc nhat, luat bat
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 nay quang ma hoa. ((hieu va) OR (hieu qua)) nang luc bat thanh tai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach nay quang ma hoa. ((hieu va) OR (hieu qua)) nang luc bat thanh tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach nay quang ma hoa. ((hieu va) OR (hieu qua)) nang luc bat thanh tai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: so sach nay quang ma hoa. ((hieu va) OR (hieu qua)) nang luc bat thanh tai ((cua tre) or (cua te))*.