Perhaps you should try some spelling variations:
hanh trinh » canh tranh
thiet bang » thien bang, khien bang, thep bang
nhiet nang » nhiet dong, viet nang, nhieu tang
hien sach » dien sach, kien sach, thien hach
cong san » cong tac
san bang » can bang, san sang, gan bang
bang cac » nang cao, hang ca, dung cac

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 sach - ((hanh trinh) OR (hanh chinh)) ((thiet bang) or (nhiet nang)) cong san bang cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - ((hanh trinh) OR (hanh chinh)) ((thiet bang) OR (nhiet nang)) cong san bang cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - ((hanh trinh) OR (hanh chinh)) ((thiet bang) or (nhiet nang)) cong san bang cac".
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - ((hanh trinh) OR (hanh chinh)) ((thiet bang) or (nhiet nang)) cong san bang cac*.