Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
cong vang » cong lang, cong quang, cong ngang
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tuan va » toan va, quan va, than va
luan va » luan van, luat va

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 ((tuan va) OR (luan va)) nhung cong vang ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh ((tuan va) OR (luan va)) nhung cong vang ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - anh ((tuan va) OR (luan va)) nhung cong vang ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh ((tuan va) OR (luan va)) nhung cong vang ((toan cau) or (toan tap))*.