Perhaps you should try some spelling variations:
thanh vang » thanh van, thanh hang, thanh hoang
vang cua » mang cua, hang cua, tang cua
tu sach » thu sach, su sach, te sach
qua ban » cua ban
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
va ca » va cac, va cao, va cai

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) OR (nang ma)) hoa. hieu va ca ((qua ban) or (qua quan)) thanh vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (nang ma)) hoa. hieu va ca ((qua ban) OR (qua quan)) thanh vang cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang ma) OR (nang ma)) hoa. hieu va ca ((qua ban) or (qua quan)) thanh vang cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) OR (nang ma)) hoa. hieu va ca ((qua ban) or (qua quan)) thanh vang cua tre*.