Perhaps you should try some spelling variations:
cong ngoc » cong ngo, hoang ngoc, cuong ngon
ngoc toan » ngoc tuan, ngoc tan, ngoc thanh
hanh noi » hanh vi, nang noi
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
gian lan » gian lang, gian dan, giang van
va gian » va gianh, van gian, va giai
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((hanh noi) or (ha noi)) tap, nghien cuu cong ngoc toan khoa hoc xa hoi va gian lan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((hanh noi) OR (ha noi)) tap, nghien cuu cong ngoc toan khoa hoc xa hoi va gian lan.
• Adding a wildcard symbol may retrieve word variants: tu ((hanh noi) or (ha noi)) tap, nghien cuu cong ngoc toan khoa hoc xa hoi va gian lan*.