Perhaps you should try some spelling variations:
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, bang cong
chi xanh » chi danh, chi hanh, chieu xanh
cong san » cong tac
chi anh » chi danh, chi hanh, thi anh
san tai » sang tai, van tai, han tai
tai cua » thai cua, tai cuc, tri cua

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) or (chi anh)) - hanh ((trinh vat) OR (trinh van)) hang cong san tai cua~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi xanh) OR (chi anh)) - hanh ((trinh vat) OR (trinh van)) hang cong san tai cua.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi xanh) or (chi anh)) - hanh ((trinh vat) OR (trinh van)) hang cong san tai cua".
• Adding a wildcard symbol may retrieve word variants: doi ((chi xanh) or (chi anh)) - hanh ((trinh vat) OR (trinh van)) hang cong san tai cua*.