Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc tieng) or (hoc hien)) anh - canh trinh luan nhung cong ((van toan) OR (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc tieng) OR (hoc hien)) anh - canh trinh luan nhung cong ((van toan) OR (van tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc tieng) or (hoc hien)) anh - canh trinh luan nhung cong ((van toan) OR (van tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc tieng) or (hoc hien)) anh - canh trinh luan nhung cong ((van toan) OR (van tuan)) ban*.