Perhaps you should try some spelling variations:
trinh quan » trinh luat, trinh han
bang cong » dang cong, bang song, hang cong
nho hieu » nho sieu, nhu hieu, nghe hieu
nha hieu » nha dieu, nghe hieu, phan hieu
cong san » cong tac
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: ((nho hieu) OR (nha hieu)) lang - hanh ((trinh quan) or (tinh quang)) bang cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nho hieu) OR (nha hieu)) lang - hanh ((trinh quan) OR (tinh quang)) bang cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nho hieu) OR (nha hieu)) lang - hanh ((trinh quan) or (tinh quang)) bang cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((nho hieu) OR (nha hieu)) lang - hanh ((trinh quan) or (tinh quang)) bang cong san toan cau*.