Perhaps you should try some spelling variations:
tranh luat » trinh luat, trinh luan, tranh cua
tranh luan » trinh luan, trinh luat, doanh luan
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
van thanh » ban thanh, van tuan
hoc hieu » hoc thieu, hoc hien, doc hieu
van toan » van tuan, van tan, manh 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 cach - canh ((tranh luat) OR (tranh luan)) nhung cong ((van toan) or (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - canh ((tranh luat) OR (tranh luan)) nhung cong ((van toan) OR (van thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - canh ((tranh luat) OR (tranh luan)) nhung cong ((van toan) or (van thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - canh ((tranh luat) OR (tranh luan)) nhung cong ((van toan) or (van thanh)) cau*.