Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chi thanh » chi nhanh, thi thanh, cho thanh
trinh vat » trinh van, trinh luat, sinh vat
chi tach » chiu trach, chiet tach, che tac
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san phan » san pham, van phan, sat 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 ((chi tach) OR (chi thanh)) - canh ((tranh va) or (trinh vat)) thong cong san phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi tach) OR (chi thanh)) - canh ((tranh va) OR (trinh vat)) thong cong san phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi tach) OR (chi thanh)) - canh ((tranh va) or (trinh vat)) thong cong san phan tu".
• Adding a wildcard symbol may retrieve word variants: doi ((chi tach) OR (chi thanh)) - canh ((tranh va) or (trinh vat)) thong cong san phan tu*.