Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than ban » thanh ban, toan ban, than man

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) OR (hieu manh)) - hanh ((trinh han) or (trinh quan)) dung cong van than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - hanh ((trinh han) OR (trinh quan)) dung cong van than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu manh)) - hanh ((trinh han) or (trinh quan)) dung cong van than ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu manh)) - hanh ((trinh han) or (trinh quan)) dung cong van than ban*.