Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thuc van » thuc vat, thuc dan, thuc va
tap toan » tap doan, tap quan, bai toan
va toan » van toan, bai toan, va thanh
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
anh de » hanh de, anh d, anh du
anh ve » hanh ve, anh va, anh viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty xang xa hoi. hieu ((va toan) or (tap toan)) thuc van ((anh de) OR (anh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty xang xa hoi. hieu ((va toan) OR (tap toan)) thuc van ((anh de) OR (anh ve)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty xang xa hoi. hieu ((va toan) or (tap toan)) thuc van ((anh de) OR (anh ve)) cua tre*".