Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, kieu tinh
chau tinh » cuu tinh, ha tinh, cua tinh
dang cong » dung cong
bang cong » bang song, hang cong, dung cong
tranh va » tranh van, trang va, trinh va
tap toan » tap doan, tap quan, bai toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu tinh) OR (chau tinh)) - canh tranh va ((dang cong) or (bang cong)) tap toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (chau tinh)) - canh tranh va ((dang cong) OR (bang cong)) tap toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu tinh) OR (chau tinh)) - canh tranh va ((dang cong) or (bang cong)) tap toan tap*".