Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
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 van » cong vang, cong san, song van
bang cac » nang cao, hang ca, hang cau
dung cac » luong cac, dung cho, dung tai

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