Perhaps you should try some spelling variations:
quang dung » quang trung, ung dung, cuong dung
hien xanh » hien hanh, hien nhanh, chieu xanh
canh tinh » hanh tinh, canh tranh, nhanh tinh
manh tinh » man tinh, manh binh, hanh tinh
dung cong » dung trong
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - ((canh tinh) OR (manh tinh)) quang dung cong ((van toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((canh tinh) OR (manh tinh)) quang dung cong ((van toan) OR (van tan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((canh tinh) OR (manh tinh)) quang dung cong ((van toan) or (van tan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((canh tinh) OR (manh tinh)) quang dung cong ((van toan) or (van tan)) cau*.