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 thanh » ban thanh, van tuan
dung cua » dung luan, dung cho
van than » van thang, van tuan, van 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 than) OR (van thanh)) 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 than) OR (van thanh)) cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((dung cua) or (trung tuan)) dung cong ((van than) OR (van thanh)) cap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((dung cua) or (trung tuan)) dung cong ((van than) OR (van thanh)) cap*.