Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
hieu quang » thieu quang, hieu quan, hieu qua
thong cong » tong cong, thong thong, phong chong
hieu lang » chieu sang, nhieu tang, hieu van
tuong va » truong va, thuong va, luong va
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (hieu quang)) - thanh tuong va ((thong cong) OR (trong cong)) tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh tuong va ((thong cong) OR (trong cong)) tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - thanh tuong va ((thong cong) OR (trong cong)) tan toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - thanh tuong va ((thong cong) OR (trong cong)) tan toan ban*.