Perhaps you should try some spelling variations:
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 dang » hanh dong, anh dang, hanh dung
van thong » van thuong, van phong, van thang
va thong » va thuong, va phuong, he thong
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 dang ((van thong) or (va thong)) cong trinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh dang ((van thong) OR (va thong)) cong trinh toan cao.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh dang ((van thong) or (va thong)) cong trinh toan cao*.