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, bien tinh
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
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: theo ((lieu tinh) OR (diep tinh)) - hanh trinh luan ((dong cong) or (dang cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((lieu tinh) OR (diep tinh)) - hanh trinh luan ((dong cong) OR (dang cong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((lieu tinh) OR (diep tinh)) - hanh trinh luan ((dong cong) or (dang cong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((lieu tinh) OR (diep tinh)) - hanh trinh luan ((dong cong) or (dang cong)) tac toan cau*.