Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
mang xa » mang may, mang cua, hoang xa
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ty ((mang xa) or (((lang xa) or (dang xay)))) hoi. hieu van nam thuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((mang xa) OR (((lang xa) OR (dang xay)))) hoi. hieu van nam thuc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((mang xa) or (((lang xa) or (dang xay)))) hoi. hieu van nam thuc van hanh di cua tre*.