Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh thang
thong cong » trong cong, tong cong, thong thong
ho chieu » theo chieu, hoc thieu, doi chieu
va thong » va thuong, va phuong, he thong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
ho hieu » hoi hieu, nho hieu, co 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) or (ho chieu)) quang - ((nhanh mang) OR (nhanh quang)) va thong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (ho chieu)) quang - ((nhanh mang) OR (nhanh quang)) va thong cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (ho chieu)) quang - ((nhanh mang) OR (nhanh quang)) va thong cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (ho chieu)) quang - ((nhanh mang) OR (nhanh quang)) va thong cong san toan cau*.