Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu nganh » vien nganh, hiem ngan, hieu manh
cong thong » cong thuong, cong trong, dong thong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
chat cong » chat chong, chat long, chat song
thong duy » thong day, thong dung, thong thuy
duy phan » duc phan, dung phan, duy khanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((chieu sach) or (hieu nganh)) - hanh tinh chat cong thong duy phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((chieu sach) OR (hieu nganh)) - hanh tinh chat cong thong duy phan tu*.