Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, nhung don
hanh hanh » hanh han, xanh hanh, nhanh thanh
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, tam toan, hach toan
toan ban » van ban
hanh va » hang va, hanh vi

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