Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trung » thanh trung, hanh trang, manh trung
thong cong » trong cong, tong cong, thong thong
cong thanh » dong thanh, cong trinh, cong tan
trung cap » truong cao, trung tam
cap thong » cap tong, chap thuong, phap thong
gian nan » gian dan, gian lan, giai nan
gian van » giang van, gian dan, gian lan

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 (chieu sang)) - hanh trung cap thong cong thanh ((gian nan) OR (gian van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - hanh trung cap thong cong thanh ((gian nan) OR (gian van)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (chieu sang)) - hanh trung cap thong cong thanh ((gian nan) OR (gian van))".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - hanh trung cap thong cong thanh ((gian nan) OR (gian van))*.