Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
cong toan » cong tan, cong hoan, cong tuan
toan hang » toan thang, toan hanh, toan mang
tinh cua » trinh cua, tinh chat, tranh cua
sinh cua » manh cua, dinh cuu, sinh va
hang dau » hang va, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (chieu sang)) - hanh ((tinh cua) OR (sinh cua)) nhung cong toan hang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sang)) - hanh ((tinh cua) OR (sinh cua)) nhung cong toan hang dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chieu sang)) - hanh ((tinh cua) OR (sinh cua)) nhung cong toan hang dau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sang)) - hanh ((tinh cua) OR (sinh cua)) nhung cong toan hang dau*.