Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dong trong » duong trong, dung trong, cong trong
theo chu » theo chieu, cho chu, chao chu
trinh ha » trinh han, trinh hoa, trinh nha
tap toan » tap doan, tap quan, bai toan
van toan » van tuan, van tan, van thanh
doi chi » doi khi
ha dong » hoat dong, van dong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chu) or (doi chi)) xanh - canh trinh ha dong trong ((tap toan) or (van toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chu) OR (doi chi)) xanh - canh trinh ha dong trong ((tap toan) OR (van toan)) ban.
• Adding a wildcard symbol may retrieve word variants: ((theo chu) or (doi chi)) xanh - canh trinh ha dong trong ((tap toan) or (van toan)) ban*.