Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh van » tran van, trinh van, thanh van
dung cong » dung trong
tranh va » trang va, trinh va, thanh va
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 - canh ((tranh va) or (tranh van)) dung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh ((tranh va) OR (tranh van)) dung cong dan chan cau*.