Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
thong cong » trong cong, tong cong, thong thong
trinh ve » trinh va, trinh vi, trinh viet
trinh he » trinh han, trinh hoa, trinh thi
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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