Perhaps you should try some spelling variations:
van thuong » va thuong, van chuong, van phuong
trinh toan » tinh toan, thanh toan, trinh han
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
van thong » van phong, va thong, van thang
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: theo hieu lang - ((hanh tang) or (hanh mang)) ((van thong) OR (van thuong)) cong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - ((hanh tang) OR (hanh mang)) ((van thong) OR (van thuong)) cong trinh toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - ((hanh tang) or (hanh mang)) ((van thong) OR (van thuong)) cong trinh toan cau*".