Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
tro ca » tro cua, tro cap, tho ca
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 dang ma hoi. ((hieu ve) or (lieu va)) cac tro ca dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty dang ma hoi. ((hieu ve) OR (lieu va)) cac tro ca dan vi cua tre*.