Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thang cong » thanh cong, thang long, thong cong
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
trinh van » trinh han, trinh quan, trinh toan
van thang » van thanh, van khang, van hang
cong san » cong tac
phan cac » nhan cach, phan dau, phan van
phan lap » phan dau

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 hanh)) - canh trinh van thang cong san ((phan cac) OR (phan lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - canh trinh van thang cong san ((phan cac) OR (phan lap))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - canh trinh van thang cong san ((phan cac) OR (phan lap))*.