Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tieu tinh » trieu tinh, tieu trinh, lieu tinh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
hang cong » dang cong, hang nong, bang cong
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: theo tieu tinh - hanh trinh cua ((dung cong) or (hang cong)) tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - hanh trinh cua ((dung cong) OR (hang cong)) tap toan ban*.