Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hanh doanh » hang doanh, chinh doanh, doanh doanh
thong bai » thong tai, nhung bai, thong xay
cua dang » cua cong
bai toan » bai tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) or (chieu sang)) - hanh doanh ((cua dang) OR (cua ban)) thong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chieu sang)) - hanh doanh ((cua dang) OR (cua ban)) thong bai toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chieu sang)) - hanh doanh ((cua dang) OR (cua ban)) thong bai toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu sang)) - hanh doanh ((cua dang) OR (cua ban)) thong bai toan ban*.