Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong than » thong thanh, thong phan, thong nhan
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua khong, cua tong
than toan » thanh toan, than tuan, thuat toan
hoc hieu » hoc thieu, hoc hien, doc hieu
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: hoc hieu lang - ((canh tranh) or (thanh trung)) cua thong thong than toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((canh tranh) OR (thanh trung)) cua thong thong than toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((canh tranh) or (thanh trung)) cua thong thong than toan ban*.