Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
manh cua » doanh cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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 ((chieu sang) OR (hieu lang)) - canh ((manh cua) or (ban cua)) thong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - canh ((manh cua) OR (ban cua)) thong cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - canh ((manh cua) or (ban cua)) thong cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - canh ((manh cua) or (ban cua)) thong cong tac toan cau*.