Perhaps you should try some spelling variations:
sach tham » sach nha
thu sach » tu sach, thuat sach, thuoc sach
doan sai » doan hai, doan mai, doanh tai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
va doan » va doanh, van doan, va dan
cuu tre » cau tren, cau treo
thuc va » thuc vat, thuc dan, thuc day
lang xa » lang ha, dang xay, lang van
bang xa » bang va, mang xa, ang xa
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)) hoi. hieu van am thuc va doan sai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tham ((bang xa) OR (lang xa)) hoi. hieu van am thuc va doan sai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tham ((bang xa) or (lang xa)) hoi. hieu van am thuc va doan sai ((cua tre) OR (cuu tre))*".