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
dung cac » luong cac, dung cho, dung tai
hang ca » hang va, nang cao, hang 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 ((hang ca) 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 ((hang ca) OR (dung cac)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh trinh ((thiet bang) or (nhiet nang)) cong van ((hang ca) or (dung cac))*.