Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
nam thuc » nam thuoc, am thuc, nam thu
lang van » dang van, tang van, hoang van
cu tren » tu tren, dua tren
dan vat » dang vat, van vat, dan va
thuc ca » thuc cua, thuc can, thuc cao
toc sac » toc sach, toc san, hoc sach
lang xa » lang ha, dang xay
qua nam » quan nam, cua nam, quang nam
sac ky » cac ky, sai ky
ca dan » cac dan, ca dao

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

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