Perhaps you should try some spelling variations:
chieu tach » chiet tach, chieu sach, chiu trach
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trinh ve » trinh he, trinh va, trinh viet
trinh vi » trinh va, trinh viet, trinh van
cong van » cong vang, cong san, song van
tai tap » tai tao, hai tap, lai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tach - hanh ((trinh ve) or (trinh vi)) dung cong van ((tai tap) or (bai tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tach - hanh ((trinh ve) OR (trinh vi)) dung cong van ((tai tap) OR (bai tap)).
• Adding a wildcard symbol may retrieve word variants: ho chieu tach - hanh ((trinh ve) or (trinh vi)) dung cong van ((tai tap) or (bai tap))*.