Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
thong cong » trong cong, tong cong, thong thong
hanh phan » thanh phan, anh phan, hanh nhan
hanh han » hanh nhan, hanh san, anh han
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tai » toan tap, doanh tai, 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: toc ((thieu sang) OR (thieu quang)) - ((hanh han) or (hanh phan)) va thong cong dan toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu quang)) - ((hanh han) OR (hanh phan)) va thong cong dan toan tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) OR (thieu quang)) - ((hanh han) or (hanh phan)) va thong cong dan toan tai".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) OR (thieu quang)) - ((hanh han) or (hanh phan)) va thong cong dan toan tai*.