Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (hieu quang)) - manh trung va nhung cong dan thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (hieu quang)) - manh trung va nhung cong dan thanh cac".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (hieu quang)) - manh trung va nhung cong dan thanh cac*.