Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
bang cong » dang cong, bang song, hang cong
dan van » dang van, doan van, dao van

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

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