Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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 sang) OR (chieu sach)) - hanh trinh vat ((nhung cong) or (dung cong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (chieu sach)) - hanh trinh vat ((nhung cong) OR (dung cong)) tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (chieu sach)) - hanh trinh vat ((nhung cong) or (dung cong)) tac toan ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (chieu sach)) - hanh trinh vat ((nhung cong) or (dung cong)) tac toan ban*.