Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
thi phap » thi hai, thi ha, thi hao
cong van » cong vang, cong san, song van
van bai » van ban, van bao, van hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo phap) or (thi phap)) tinh - thanh trung cua nhung cong van bai tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo phap) OR (thi phap)) tinh - thanh trung cua nhung cong van bai tap.
• Adding a wildcard symbol may retrieve word variants: ((theo phap) or (thi phap)) tinh - thanh trung cua nhung cong van bai tap*.