Perhaps you should try some spelling variations:
thuat trinh » thuat tinh, thuyet trinh, thuat trong
thanh tung » thanh cong
cong cong » cong dong, trong cong, dung cong
ho thuat » hoc thuat, ho thuan, khoi thuat
tung cua » trung cua, tuong cua, dung cua
van than » van thanh, van thang, van tuan
van tai » von tai, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho thuat trinh - thanh tung cua cong cong ((van than) or (van tai)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thuat trinh - thanh tung cua cong cong ((van than) OR (van tai)) cau.
• Adding a wildcard symbol may retrieve word variants: ho thuat trinh - thanh tung cua cong cong ((van than) or (van tai)) cau*.