Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
manh trung » manh tung, thanh trung, manh hung
hien xanh » hien hanh, chieu xanh, hien khanh
trung dan » trung dai, tung dan, trung van
dung cong » dung trong
dan dung » van dung, tin dung, ap dung
san phan » van phan, sat phan, dan phan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - manh trung dan dung cong ((san phan) OR (san pham)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - manh trung dan dung cong ((san phan) OR (san pham)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - manh trung dan dung cong ((san phan) OR (san pham)) cau*.