Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
luat dung » suat dung, luat chung, luat quang
dung cong » dung trong
doi hieu » doi chieu, doc hieu, doi hien
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh trinh luat dung cong ((tac toan) OR (tap toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh trinh luat dung cong ((tac toan) OR (tap toan)) tap".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh trinh luat dung cong ((tac toan) OR (tap toan)) tap*.