Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cua rung » cua trung, cua rang, cua truong
qua dung » quang dung, su dung, qua song
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu

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 - canh tranh ((cua rung) or (qua dung)) cong san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh ((cua rung) OR (qua dung)) cong san phan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh ((cua rung) or (qua dung)) cong san phan cau*.