Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
anh quang » anh xquang, anh quan, nhanh quang
anh dang » anh dung, anh bang, anh danh
anh dong » anh huong, anh son
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than man » than ma, thanh san, tran manh

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 quang) or (((anh dang) or (anh dong)))) va thong cong tan than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((anh quang) OR (((anh dang) OR (anh dong)))) va thong cong tan than man.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((anh quang) or (((anh dang) or (anh dong)))) va thong cong tan than man*.