Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, biet lang
canh hanh » xanh hanh, canh tranh, danh thanh
hieu van » hieu va, thien van, lieu va
cong dan » cong san, cong tan, huong dan
hanh va » hang va, hanh vi
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((((hieu lang) or (hieu van))) or (nhieu tang)) - canh hanh va nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((((hieu lang) OR (hieu van))) OR (nhieu tang)) - canh hanh va nhung cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: theo ((((hieu lang) or (hieu van))) or (nhieu tang)) - canh hanh va nhung cong dan van ban*.