Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
manh cua » doanh cua
cong tac » cong ty
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - canh ((manh cua) or (ban cua)) thong cong tac ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - canh ((manh cua) OR (ban cua)) thong cong tac ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - canh ((manh cua) or (ban cua)) thong cong tac ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - canh ((manh cua) or (ban cua)) thong cong tac ((toan cau) OR (toan cao))*.