Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, nhieu tang
hanh thang » nhanh thang, thanh thang, hanh trang
hieu lang » hieu quang, nhieu tang, hieu van
thang va » hang va, trang va, thong va
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: theo ((chieu sach) or (((chieu sang) OR (hieu lang)))) - hanh thang va thuong cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (((chieu sang) OR (hieu lang)))) - hanh thang va thuong cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (((chieu sang) OR (hieu lang)))) - hanh thang va thuong cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (((chieu sang) OR (hieu lang)))) - hanh thang va thuong cong tac toan cao*.