Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
ninh thong » dinh thong, hinh thong, dinh thuong
thong dung » thong cong, thong thuong
trong dang » truong dang, trong dan, trong dong
hieu lang » hieu quang, nhieu tang, hieu van
tinh ninh » ninh binh
dang phan » dung phan, nang phan, dang phat
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu sang)) - tinh ninh thong dung trong dang phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sang)) - tinh ninh thong dung trong dang phan dau.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sang)) - tinh ninh thong dung trong dang phan dau*.