Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
doi chieu » doi chi, ho chieu, mot chieu
trinh vat » trinh van, trinh luat, sinh vat
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh ve, trinh vi
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat

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