Perhaps you should try some spelling variations:
thanh hang » thanh hoang, thanh thang, tranh hang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hieu quan » hieu qua, lieu quan, thien quan
san chan » san chang, dan chan, ban chan
san chay » san pham, van chat, dan chan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) or (hieu quan)) - thanh hang va nhung cong ((san chan) OR (san chay)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (hieu quan)) - thanh hang va nhung cong ((san chan) OR (san chay)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) or (hieu quan)) - thanh hang va nhung cong ((san chan) OR (san chay)) cao".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (hieu quan)) - thanh hang va nhung cong ((san chan) OR (san chay)) cao*.