Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
mang cua » dung cua, ban cua, cong cua
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban

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

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