Perhaps you should try some spelling variations:
dieu tinh » diep tinh, lieu tinh, dien tinh
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
van thang » van thanh, van khang, van hang
hoc dieu » hoc thieu, hoc hien
cua bang » chua bang, cua ban, cua dang
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu tinh - canh tranh cua bang cong ((ban than) or (van thang)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu tinh - canh tranh cua bang cong ((ban than) OR (van thang)) ban*.