Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cong dang » cong dong, cong dan, cong dung
dang toan » dang tran, dan toan, dung toan
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (trieu tinh)) - canh tranh va thong cong dang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (trieu tinh)) - canh tranh va thong cong dang toan cao*.