Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
thong cong » trong cong, tong cong, thong thong
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
cua thong » cua thuong, cua khong, cua tong
hanh san » thanh san, khach san, thanh son
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) OR (hien hanh)) - ((thanh sang) or (hanh san)) cua thong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - ((thanh sang) OR (hanh san)) cua thong cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - ((thanh sang) or (hanh san)) cua thong cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - ((thanh sang) or (hanh san)) cua thong cong dan toan cao*.