Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
nang cong » nang song, dang cong, hang cong
bang cong » dang cong, bang song, hang cong
trinh va » trinh van, trinh vat, trinh ve
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 - hanh trinh va ((nang cong) or (bang cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh trinh va ((nang cong) OR (bang cong)) dan than cau*.