Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
tranh cua » doanh cua, manh cua
tuong bai » tuong lai, cuong bai, thong bai
ho chieu » theo chieu, hoc thieu, mot chieu
va tuong » va thuong, va thong, xa truong
bai toan » bai tap
toan ban » van ban
cua va » cua vat, chua va, cua van

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) or (doi chieu)) xanh - canh tranh cua va tuong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - canh tranh cua va tuong bai toan ban.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - canh tranh cua va tuong bai toan ban*.