Perhaps you should try some spelling variations:
chieu tach » chiet tach, chieu sach, chiu trach
thong cong » tong cong, thong thong, phong chong
doi chieu » doc hieu, doi chi, ho chieu
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
tan phan » toan phan, than phan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu tach - canh ((trinh va) or (trinh vat)) ((thong cong) OR (trong cong)) tan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tach - canh ((trinh va) OR (trinh vat)) ((thong cong) OR (trong cong)) tan phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu tach - canh ((trinh va) or (trinh vat)) ((thong cong) OR (trong cong)) tan phan tu".
• Adding a wildcard symbol may retrieve word variants: doi chieu tach - canh ((trinh va) or (trinh vat)) ((thong cong) OR (trong cong)) tan phan tu*.