Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
luan dong » luan cong, quan dong, luan nong
dong cong » duong cong, dung cong, dang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (toc thieu)) manh - hanh trinh luan dong cong ((tac toan) OR (tam toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (toc thieu)) manh - hanh trinh luan dong cong ((tac toan) OR (tam toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (toc thieu)) manh - hanh trinh luan dong cong ((tac toan) OR (tam toan)) tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (toc thieu)) manh - hanh trinh luan dong cong ((tac toan) OR (tam toan)) tap*.