Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
bien tinh » yen tinh, diep tinh, ban tinh
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
tranh va » tranh van, trang va, trinh va
toan ban » van ban
bi tinh » vi tinh
ty toan » ly toan, tap toan, huy toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((bien tinh) OR (bi tinh)) - hanh tranh va ((nang cong) or (dang cong)) ty toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((bien tinh) OR (bi tinh)) - hanh tranh va ((nang cong) OR (dang cong)) ty toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((bien tinh) OR (bi tinh)) - hanh tranh va ((nang cong) or (dang cong)) ty toan ban".
• Adding a wildcard symbol may retrieve word variants: theo ((bien tinh) OR (bi tinh)) - hanh tranh va ((nang cong) or (dang cong)) ty toan ban*.