Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hoc hieu » hoc thieu, hoc hien, doc hieu
chinh ta » chinh tai, chinh va, chinh tri
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
chat cau » chat cam, chat cao, chat va
ta dung » tac dung, tan dung, tao dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh chinh ta dung ((cong van) OR (song van)) chat cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh chinh ta dung ((cong van) OR (song van)) chat cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh chinh ta dung ((cong van) OR (song van)) chat cau*.