Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu xanh » hieu manh, hieu nganh, dieu hanh
hanh mang » nhanh mang, hanh trang, nhanh lang
mang quan » nang quan, tang quan, hang quan
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
vang toan » van toan, quang toan, vang trang
dang toan » dang tran, dan toan, dung toan

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 (chieu xanh)) - hanh mang quan dung cong ((vang toan) or (dang toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - hanh mang quan dung cong ((vang toan) OR (dang toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - hanh mang quan dung cong ((vang toan) or (dang toan)) ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (chieu xanh)) - hanh mang quan dung cong ((vang toan) or (dang toan)) ban*.