Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
cua trong » cua truong, cua trung, ca trong
qua trong » quan trong, qua trinh, qua song
25 trieu » 30 trieu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » 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: 25 trieu tinh - hanh trang ((cua trong) or (qua trong)) cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: 25 trieu tinh - hanh trang ((cua trong) OR (qua trong)) cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: 25 trieu tinh - hanh trang ((cua trong) or (qua trong)) cong tap toan cau*.