Perhaps you should try some spelling variations:
sach tham » sach nha
thu sach » tu sach, thuat sach, thuoc sach
thuc day » thuc dan, thuc vat
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
sai cua » dai cua, hai cua, lai cua
dan sai » danh sai, doan sai, dan tai
day dan » day danh, dao dan, cay dan
lang xa » lang ha, lang van
bang xa » bang va, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
van am » van nam, van lam, van dam

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 tham ((bang xa) or (((lang xa) or (dang xay)))) hoi. hieu van am thuc day dan sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tham ((bang xa) OR (((lang xa) OR (dang xay)))) hoi. hieu van am thuc day dan sai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach tham ((bang xa) or (((lang xa) or (dang xay)))) hoi. hieu van am thuc day dan sai cua tre*.