Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong, khien vong
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
tuan hoang » quan hoang, tran hoang, xuan hoang
hoc khien » hoc hien, hoc nghien, hoc thieu
cong suat » cong san, cong cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc khien bang - hanh trung tuan hoang ((cong suat) or (nang suat)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien bang - hanh trung tuan hoang ((cong suat) OR (nang suat)) phan tu*.