Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
thanh tuong » thanh thuong, thanh tung, thanh huong
hieu quang » hieu quan, hieu qua, diep quang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
tuong va » truong va, thuong va, luong va
cong tan » cong tac, cong san, cong thanh
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) OR (thieu quang)))) - thanh tuong va nhung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (((hieu quang) OR (thieu quang)))) - thanh tuong va nhung cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (((hieu quang) OR (thieu quang)))) - thanh tuong va nhung cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (((hieu quang) OR (thieu quang)))) - thanh tuong va nhung cong tan toan ban*.