Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong tac » cong ty
pham tu » pham thi, pham tai, pham duc

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 sang - canh trinh va thong cong tac ((pham tu) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - canh trinh va thong cong tac ((pham tu) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - canh trinh va thong cong tac ((pham tu) OR (phan tu))*.