Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » thong cong, hang cong, nhung don
hien xanh » hien hanh, chieu xanh, hien khanh
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
dan phan » doan phan, dan chan, van 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) or (hien nhanh)) - canh trinh van ((nhung cong) or (dung cong)) dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - canh trinh van ((nhung cong) OR (dung cong)) dan phan tu.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - canh trinh van ((nhung cong) or (dung cong)) dan phan tu*.