Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh tang » hanh trang, hanh mang, hanh tung
chua nang » chuc nang, chua xang, kha nang
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cua nang » cua dang, cua hang, cua nong
cong san » cong tac
san phan » san pham, van phan, sat phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - ((hanh tang) or (anh tang)) ((cua nang) or (chua nang)) cong san phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((hanh tang) OR (anh tang)) ((cua nang) OR (chua nang)) cong san phan tu.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((hanh tang) or (anh tang)) ((cua nang) or (chua nang)) cong san phan tu*.