Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
tranh cua » doanh cua
phan cong » thanh cong
manh cua » doanh cua, ban cua
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu lang) or (hieu quang)) - canh ((tranh cua) OR (manh cua)) phan cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu lang) OR (hieu quang)) - canh ((tranh cua) OR (manh cua)) phan cong tap toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu lang) or (hieu quang)) - canh ((tranh cua) OR (manh cua)) phan cong tap toan cau".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) or (hieu quang)) - canh ((tranh cua) OR (manh cua)) phan cong tap toan cau*.