Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
nhieu tang » chieu sang, nhiet nang
hung tuong » nhung tuong, hung vuong, hung cuong
hieu lang » chieu sang, hieu van, biet lang
tuong dan » huong dan, tung dan, xuong dan
trung va » truong va, trang va, trung ha
dan chan » dan gian, dan ca, van chat
va hung » va nhung, van hung, va huong
chan ta » chan tha, nhan tai, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((((hieu lang) OR (hieu quang))) or (nhieu tang)) - thanh trung va hung tuong dan chan ta~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((((hieu lang) OR (hieu quang))) OR (nhieu tang)) - thanh trung va hung tuong dan chan ta*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((((hieu lang) OR (hieu quang))) or (nhieu tang)) - thanh trung va hung tuong dan chan ta*".