Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
hieu quang » thieu quang, hieu quan, hieu qua
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, nhieu tang, hieu van
va thong » va phuong, he thong, va cong
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: ho ((hieu lang) or (hieu quang)) - hanh truong ((va thong) OR (va thuong)) cong trinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - hanh truong ((va thong) OR (va thuong)) cong trinh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - hanh truong ((va thong) OR (va thuong)) cong trinh toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - hanh truong ((va thong) OR (va thuong)) cong trinh toan cao*.