Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
cua dung » cua dang, cua dong, cua nhung
cua rung » cua trung, cua rang, cua truong
qua dung » quang dung, su dung, qua song
chung xa » chung ta, chung nam, chung cua
phan cau » phan dau, phan cac, phan tu
xa phan » va phan, a phan, x phan

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 ((((cua dung) OR (cua rung))) or (qua dung)) chung xa phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh ((((cua dung) OR (cua rung))) OR (qua dung)) chung xa phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - canh tranh ((((cua dung) OR (cua rung))) or (qua dung)) chung xa phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh ((((cua dung) OR (cua rung))) or (qua dung)) chung xa phan cau*.