Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
lieu tinh » trieu tinh, diep tinh, bien tinh
dung cong » dung trong
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
so lieu » so dieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so lieu tinh - hanh trinh luan ((dang cong) or (dung cong)) dan ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - hanh trinh luan ((dang cong) OR (dung cong)) dan ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so lieu tinh - hanh trinh luan ((dang cong) or (dung cong)) dan ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - hanh trinh luan ((dang cong) or (dung cong)) dan ((toan cau) OR (toan ban))*.