Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
van phanh » van thanh, van hanh, van khanh
dung cua » dung luan, dung cho
van phan » van phong, van thanh, luan phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - hanh ((dung cua) or (trung tuan)) dung cong ((van phan) or (van phanh)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((dung cua) OR (trung tuan)) dung cong ((van phan) OR (van phanh)) cap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((dung cua) or (trung tuan)) dung cong ((van phan) or (van phanh)) cap*.