Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh quan, trinh luan
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: hoc ((hien xanh) or (hieu lang)) - hanh ((trinh cua) OR (trinh luat)) nhung cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hieu lang)) - hanh ((trinh cua) OR (trinh luat)) nhung cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hieu lang)) - hanh ((trinh cua) OR (trinh luat)) nhung cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hieu lang)) - hanh ((trinh cua) OR (trinh luat)) nhung cong dan toan ban*.