Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
bien tinh » bi tinh, yen tinh, diep tinh
nhung cau » chung cu, nhung bai, nhu cau
dung cong » dung trong
hoc bien » hoc hien, hoc vien, hoa bien
dan toan » van toan, dan than, manh 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: hoc bien tinh - hanh trinh luat ((nhung cau) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc bien tinh - hanh trinh luat ((nhung cau) OR (dung cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc bien tinh - hanh trinh luat ((nhung cau) or (dung cong)) dan toan cao*.