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