Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh han, trinh toan
trinh quan » tinh quang, trinh luat, trinh han
khong cong » thong cong, khong cang, chong cong
tac thanh » bac thanh, cac thanh, tcc thanh
toc tien » hoc tien, toc mien, toc stieng
tien anh » tieng anh, tien manh, dien anh
tac than » tam than, tac nhan, bac thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc tien anh - hanh ((trinh luan) or (trinh quan)) khong cong ((tac than) or (tac thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc tien anh - hanh ((trinh luan) OR (trinh quan)) khong cong ((tac than) OR (tac thanh)) cau.
• Adding a wildcard symbol may retrieve word variants: toc tien anh - hanh ((trinh luan) or (trinh quan)) khong cong ((tac than) or (tac thanh)) cau*.