Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
trinh chao » trinh han, trinh co, trinh giao
trinh chat » tinh chat, trinh luat, trinh han
doc chieu » doc hieu, doi chieu, toc thieu
dong dan » dong danh, duong dan, cong dan
dong san » cong san, dong bang, dong von

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc chieu tinh - hanh ((trinh chao) or (trinh chat)) truong ((dong dan) OR (dong san)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc chieu tinh - hanh ((trinh chao) OR (trinh chat)) truong ((dong dan) OR (dong san)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc chieu tinh - hanh ((trinh chao) or (trinh chat)) truong ((dong dan) OR (dong san)) phan tu".
• Adding a wildcard symbol may retrieve word variants: doc chieu tinh - hanh ((trinh chao) or (trinh chat)) truong ((dong dan) OR (dong san)) phan tu*.