Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
tranh va » tranh van, trinh va, thanh va
trang va » tran van, hang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu khang) or (chieu xanh)) - canh ((tranh va) OR (trang va)) nhung cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu khang) OR (chieu xanh)) - canh ((tranh va) OR (trang va)) nhung cong tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu khang) or (chieu xanh)) - canh ((tranh va) OR (trang va)) nhung cong tac toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu khang) or (chieu xanh)) - canh ((tranh va) OR (trang va)) nhung cong tac toan tap*.