Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
tinh cua » trinh cua, tinh chat, tranh cua
sinh cua » dinh cuu, sinh va
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 - hanh ((tinh cua) or (((sinh cua) OR (manh cua)))) dung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((tinh cua) OR (((sinh cua) OR (manh cua)))) dung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((tinh cua) or (((sinh cua) OR (manh cua)))) dung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((tinh cua) or (((sinh cua) OR (manh cua)))) dung cong dan toan cao*.