Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
chi xanh » chi anh, chi danh, chi hanh
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong san » cong tac
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap
doi chi » doi khi

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 xanh - hanh ((trinh va) OR (trinh ve)) duong cong san ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - hanh ((trinh va) OR (trinh ve)) duong cong san ((toan tai) OR (toan cao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - hanh ((trinh va) OR (trinh ve)) duong cong san ((toan tai) or (toan cao))*".