Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
truc van » thuc van, truc ban, truc dan
truc va » thuc va, thuc vat, trung va
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, dang xay
ang xa » lang xa, mang xa, dang xay
anh va » hanh va
va cua » va chua, via cua, ca cua
va dai » va dao, vi dai, va dau

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 ((xang xa) or (ang xa)) hoi. hieu va dai ((truc van) OR (truc va)) anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((xang xa) OR (ang xa)) hoi. hieu va dai ((truc van) OR (truc va)) anh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((xang xa) or (ang xa)) hoi. hieu va dai ((truc van) OR (truc va)) anh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((xang xa) or (ang xa)) hoi. hieu va dai ((truc van) OR (truc va)) anh va cua tre*.