Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, nhieu tang, hieu van
tranh van » tran van, trinh van, thanh van
tac thanh » bac thanh, cac thanh, tcc thanh
thanh lap » thanh san, phan lap, thanh hai
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty

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

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