Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh vap » trinh van, trinh vat, trinh va
dung cong » dung trong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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 - hanh trinh vap ((nhung cong) OR (dung cong)) dan than tap~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trinh vap ((nhung cong) or (dung cong)) dan than tap*.