Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tong cong » trong cong, cong cong, dung cong
mang cua » dung cua, ban cua, cong cua
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 ((mang cua) or (manh cua)) tong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((mang cua) OR (manh cua)) tong cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((mang cua) or (manh cua)) tong cong dan toan cao*.