Perhaps you should try some spelling variations:
cong trong » cong thuong, duong trong, cong trinh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, hanh trang, nhanh lang
trong san » trong cac, cong san, dong san
anh nang » ganh nang, anh bang, anh dang
san toan » van toan, dan toan, manh 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: theo hieu lang - ((hanh mang) or (anh nang)) cua cong trong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - ((hanh mang) OR (anh nang)) cua cong trong san toan cau*.