Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
dau vat » dau va, bau vat, dan vat
sach ky » sac ky, sach y, sach ty
te sach » toc sach
lang xa » lang ha, dang xay, lang van
dang xa » dang xay, dang ha, dang va
nam tuc » nam thuc, nam truc, nam tu
tuc va » thuc va, truc va, tuc xa
va dau » va dao

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 ((dang xa) or (lang xa)) hoi. hieu van nam tuc va dau vat ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((dang xa) OR (lang xa)) hoi. hieu van nam tuc va dau vat ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((dang xa) or (lang xa)) hoi. hieu van nam tuc va dau vat ((cua tre) or (cau tren))*.