Perhaps you should try some spelling variations:
nhanh lang » nhanh quang, nhanh thang, nhan dang
cong thang » cong thanh, cang thang, cong thong
lang dang » lang dong, dang dang, lang thang
dang cong » dung cong
doc hieu » hoc thieu, hoc hien
thang ca » thang cua, hang ca, tang ca
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: ((doc hieu) or (toc thieu)) tinh - nhanh lang dang cong thang ca dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - nhanh lang dang cong thang ca dan ca.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - nhanh lang dang cong thang ca dan ca*.