Perhaps you should try some spelling variations:
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
trinh san » trinh han, trinh quan, trinh toan
trinh cau » trinh chat, trinh chao, trinh tu
dung cong » dung trong
van luan » van quan, von luan, vay luan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh ((trinh san) or (trinh cau)) dung cong ((van luan) or (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh ((trinh san) OR (trinh cau)) dung cong ((van luan) OR (van tuan)) ban.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh ((trinh san) or (trinh cau)) dung cong ((van luan) or (van tuan)) ban*.