Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
luat hang » luat chung, luat quang, luat huong
luat hanh » luat hinh, luat canh, luat danh
doc hieu » toc thieu, hoc thieu, hoc hien
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: doc hieu xanh - hanh trinh ((luat hang) OR (luat hanh)) cong tap toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh trinh ((luat hang) OR (luat hanh)) cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trinh ((luat hang) OR (luat hanh)) cong tap toan cao*.