Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, hieu cach
chieu sang » hieu lang, nhieu tang
chieu xanh » chieu tinh, hieu manh
thong cong » trong cong, tong cong, thong thong
hanh hang » thanh hang, hang hang, hanh han
hoc thong » hoc thuong, hoc trong, hoc hong
tap doanh » tap doan, lap doanh, tap danh
doanh bat » danh bat, doanh tai, doanh va
hang hoc » hang hoa, nang hoc, bang hoc
cong tap » cuong tap, cong tac, cong tan

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

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