Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien xanh » hien hanh, hien nhanh, chieu xanh
van dung » van dong, xay dung, tin dung
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
va dung » va duong, vat dung, va ung

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