Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien sang » hien trang, khien bang, chieu sang
trinh han » trinh quan
han trong » hanh trong, nhan trong, phan trong
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca
van chat » cao chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sang - hanh trinh han trong cong ((dan toan) or (((dan chan) or (van chat)))) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh trinh han trong cong ((dan toan) OR (((dan chan) OR (van chat)))) ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh trinh han trong cong ((dan toan) or (((dan chan) or (van chat)))) ban*.