Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sach » chinh sach, chiet tach, chieu sang
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
thanh lap » thanh san, phan lap, thanh hai
khoan cam » khoa cam, khoan va, phan cam
ho chieu » theo chieu, hoc thieu, doi chieu
mang cua » manh cua, dung cua, ban cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - hanh mang cua ((nhung cong) OR (dung cong)) dan ((thanh lap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh mang cua ((nhung cong) OR (dung cong)) dan ((thanh lap) OR (khoan cam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh mang cua ((nhung cong) OR (dung cong)) dan ((thanh lap) or (khoan cam))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh mang cua ((nhung cong) OR (dung cong)) dan ((thanh lap) or (khoan cam))*.