Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
quan lang » quan hoang, quan luan, quan van
gian lang » gian dan
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: ((doi chieu) or (hoc thieu)) xanh - hanh trinh ((quan lang) OR (gian lang)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) xanh - hanh trinh ((quan lang) OR (gian lang)) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) xanh - hanh trinh ((quan lang) OR (gian lang)) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) xanh - hanh trinh ((quan lang) OR (gian lang)) cong tac toan cau*.