Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh hang » thanh hang, hang hang, hanh han
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
va bang » va nang, va lang, va hang
va ban » van ban, va bai, va bao

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