Perhaps you should try some spelling variations:
quan trong » gian trong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
lanh ban » lanh bang, lang ban, doanh ban
ban quan » van quan
cong tac » cong ty
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: ho ((hieu lang) OR (chieu sang)) - lanh ban quan trong ((cong san) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sang)) - lanh ban quan trong ((cong san) OR (cong tac)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (chieu sang)) - lanh ban quan trong ((cong san) or (cong tac)) toan cau*".