Perhaps you should try some spelling variations:
tcanh tranh » can tranh, lanh tranh, thanh tran
thanh thanh » nhanh thanh, thanh toan, thanh phan
trong quang » truong quang, thong quang, trong quan
chieu sang » chieu sach, chieu xanh, hieu lang
khoa trong » hoa trong, khoa trung, khoang trong
doi chieu » doc hieu, doi chi, ho chieu
quang van » quang ban, quan van, quang uan
cua khoa » chua khoa, sua khoa, qua khoa

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 - ((canh tranh) or (((tcanh tranh) OR (thanh thanh)))) cua khoa trong quang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((canh tranh) OR (((tcanh tranh) OR (thanh thanh)))) cua khoa trong quang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((canh tranh) or (((tcanh tranh) OR (thanh thanh)))) cua khoa trong quang van ban".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((canh tranh) or (((tcanh tranh) OR (thanh thanh)))) cua khoa trong quang van ban*.