Perhaps you should try some spelling variations:
quan trong » gian trong
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, mot chieu
thanh ban » thanh san, thanh van, thanh bac
tan doanh » toan doanh, van doanh, ban doanh
san doanh » van doanh, toan doanh, vay doanh
hanh ban » hang ban, hanh san, hanh han

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - ((hanh ban) OR (thanh ban)) quan trong cong ((tan doanh) or (san doanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh ban) OR (thanh ban)) quan trong cong ((tan doanh) OR (san doanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh ban) OR (thanh ban)) quan trong cong ((tan doanh) or (san doanh)) cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh ban) OR (thanh ban)) quan trong cong ((tan doanh) or (san doanh)) cao*.