Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
kinh va » kinh van, tinh va, sinh va
cuu tre » cau treo
cua tre » cua te, cua triet, dua tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
dung ha » dung va, dung he, dung khoa
ky dung » ly dung, ky dang, ky vung
va kinh » va tinh, qua kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dung ha noi. hieu van nam thuc va kinh va ((cua tre) or (((cuu tre) or (cau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dung ha noi. hieu van nam thuc va kinh va ((cua tre) OR (((cuu tre) OR (cau tren)))).
• Adding a wildcard symbol may retrieve word variants: te sach ky dung ha noi. hieu van nam thuc va kinh va ((cua tre) or (((cuu tre) or (cau tren))))*.