Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thong cong » trong cong, thong thong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
tuong cua » truong cua, huong cua, thong cua
tong cong » trong cong, cong cong, dung cong
bang cong » dang cong, bang song, hang cong
ban toan » bai toan, ban than, van toan
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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 - thanh tuong cua ((((thong cong) OR (tong cong))) or (bang cong)) ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh tuong cua ((((thong cong) OR (tong cong))) OR (bang cong)) ban toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh tuong cua ((((thong cong) OR (tong cong))) or (bang cong)) ban toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh tuong cua ((((thong cong) OR (tong cong))) or (bang cong)) ban toan cau*.