Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
lang van » dang van, tang van, hoang van
cau tren » cu tren, dau tren, ca tren
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
thuc va » thuc vat, thuc dan, thuc day
dan vat » dang vat, van vat, dan va
va dan » ca dan, va dao, va dau
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((lang xa) or (lang van)) hoi. hieu va nam thuc va dan vat ((cau tren) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (lang van)) hoi. hieu va nam thuc va dan vat ((cau tren) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (lang van)) hoi. hieu va nam thuc va dan vat ((cau tren) or (cau triet))*.