Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
cong thanh » dong thanh, cong trinh, truong thanh
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
chi xanh » chi anh, chi danh, chi hanh
cong tan » cong tac, cong san, cong ty
hang dau » hang va, hang tai
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 - canh trinh vat nhung ((cong tan) OR (cong thanh)) ((phan tu) or (hang dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - canh trinh vat nhung ((cong tan) OR (cong thanh)) ((phan tu) OR (hang dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - canh trinh vat nhung ((cong tan) OR (cong thanh)) ((phan tu) or (hang dau))".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - canh trinh vat nhung ((cong tan) OR (cong thanh)) ((phan tu) or (hang dau))*.