Perhaps you should try some spelling variations:
tranh luat » trinh luat, tranh luan, trinh luan
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
luat dung » suat dung, luat chung, luat quang
dung cong » dung trong
ban toan » ban than, van toan, bao toan
bai toan » bai 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 - canh tranh luat dung cong ((ban toan) OR (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) xanh - canh tranh luat dung cong ((ban toan) OR (bai toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) xanh - canh tranh luat dung cong ((ban toan) OR (bai toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) xanh - canh tranh luat dung cong ((ban toan) OR (bai toan)) cau*.