Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, manh trung, danh trung
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

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