Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
thanh dung » thanh tung, thanh hung, hanh dung
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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