Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
bang cong » dang cong, bang song, hang cong
nho hieu » nha hieu, nho sieu, nhu hieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, co hieu

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) or (nho hieu)) lang - hanh ((trinh quan) OR (trinh han)) bang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (nho hieu)) lang - hanh ((trinh quan) OR (trinh han)) bang cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (nho hieu)) lang - hanh ((trinh quan) OR (trinh han)) bang cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (nho hieu)) lang - hanh ((trinh quan) OR (trinh han)) bang cong dan toan cao*.