Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, lieu tinh
thien tinh » khien tinh, thien minh, tien tinh
tranh chua » tranh cua, trinh chuan, tranh chap
chua bang » chu bang, chua nang, chua xang
bang song » nang song
song tap » tong tap, song tam, cuong tap
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tinh) or (thien tinh)) - canh tranh chua bang song tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (thien tinh)) - canh tranh chua bang song tap toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) or (thien tinh)) - canh tranh chua bang song tap toan ban*.