Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
trinh quan » tinh quang, trinh luat, trinh han
hien xanh » hien hanh, chieu xanh, hien khanh
trinh van » trinh han, trinh toan, dinh van
hang cong » dang cong, hang nong, bang cong
cong san » cong tac
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 ((trinh van) OR (trinh quan)) hang cong san phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - canh ((trinh van) OR (trinh quan)) hang cong san phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - canh ((trinh van) OR (trinh quan)) hang cong san phan cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - canh ((trinh van) OR (trinh quan)) hang cong san phan cac*.