Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trinh » canh tranh, hanh chinh
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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) or (nhieu tang)) - hanh trinh luat ((tong cong) OR (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (nhieu tang)) - hanh trinh luat ((tong cong) OR (dung cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (nhieu tang)) - hanh trinh luat ((tong cong) OR (dung cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (nhieu tang)) - hanh trinh luat ((tong cong) OR (dung cong)) dan toan cao*.