Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
biet lang » bien dang, viet nang, bien nang
han duong » hai duong, van duong, thanh duong
duong va » duong van, dung va, luong va
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((((biet lang) or (hieu quang))) or (chieu sang)) - han duong va thong cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((biet lang) OR (hieu quang))) OR (chieu sang)) - han duong va thong cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: ho ((((biet lang) or (hieu quang))) or (chieu sang)) - han duong va thong cong dan than cau*.