Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
tranh vi » trinh vi, tranh cai, tranh van
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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

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