Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trong tac » trong cac, trong tan, trong tuc
tuong tac » luong tai, tuong lai
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu xanh - thanh ((trong tac) OR (tuong tac)) dung cong tac toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - thanh ((trong tac) OR (tuong tac)) dung cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - thanh ((trong tac) OR (tuong tac)) dung cong tac toan ban*.