Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
nhung don » nhung van, nhung bo
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
ban toan » bai toan, ban than, van 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: ((hoc hien) or (ho chieu)) xanh - hanh trinh quan ((nhung don) or (dung cong)) ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (ho chieu)) xanh - hanh trinh quan ((nhung don) OR (dung cong)) ban toan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (ho chieu)) xanh - hanh trinh quan ((nhung don) or (dung cong)) ban toan cau*.