Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
anh tang » anh bang, anh dang, anh sang
anh nang » ganh nang, anh bang, anh dang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - ((anh tang) OR (anh nang)) va nhung cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((anh tang) OR (anh nang)) va nhung cong dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((anh tang) OR (anh nang)) va nhung cong dan ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((anh tang) OR (anh nang)) va nhung cong dan ((toan cao) or (toan ban))*.