Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien manh » hien hanh, tien manh, hieu manh
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
trinh va » trinh van, trinh vat, trinh ve
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang 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 manh - hanh trinh va ((nang cong) OR (dang cong)) tan ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien manh - hanh trinh va ((nang cong) OR (dang cong)) tan ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - hanh trinh va ((nang cong) OR (dang cong)) tan ((phan cau) or (phan dau))*.