Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hoang cong » hang cong, hoang long, hoang trong
hien xanh » hien hanh, chieu xanh, hien khanh
tranh van » tran van, trinh van, thanh van
san phan » san pham, van phan, sat phan
phan cac » nhan cach, phan dau, phan lap

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