Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
chieu sach » chinh sach, chiet tach, chieu sang
tran thanh » ban thanh, van thanh
quan thanh » ban thanh, van thanh
dung cong » dung trong
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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) or (chieu sach)) - thanh ((tran thanh) OR (quan thanh)) dung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sach)) - thanh ((tran thanh) OR (quan thanh)) dung cong van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sach)) - thanh ((tran thanh) OR (quan thanh)) dung cong van toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sach)) - thanh ((tran thanh) OR (quan thanh)) dung cong van toan cao*.