Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
dung cong » dung trong
muong va » muong van, luong va, huong va
duong va » duong van, dung va, luong va
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (hieu lang)) - manh ((muong va) OR (duong va)) dung cong dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - manh ((muong va) OR (duong va)) dung cong dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - manh ((muong va) OR (duong va)) dung cong dan toan tap*.