Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
can van » cac van, can ban, tan van
van cua » vang cua, ban cua, dan 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 - can van cua ((nhung cong) OR (dung cong)) dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - can van cua ((nhung cong) OR (dung cong)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - can van cua ((nhung cong) OR (dung cong)) dan toan cau*.