Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh khoa » sinh hoc, sinh hoat, anh khoa
khoa hang » khoa dang, khoai lang, kho tang
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu manh) or (((chieu sach) OR (chieu sang)))) - hanh sinh khoa hang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (((chieu sach) OR (chieu sang)))) - hanh sinh khoa hang cong dan toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu manh) or (((chieu sach) OR (chieu sang)))) - hanh sinh khoa hang cong dan toan cao*".