Perhaps you should try some spelling variations:
thanh tung » thanh cong
dung cong » dung trong
chi sang » chi lang, chieu sang, chi chang
tung cao » nung cao, truong cao, trung cap
cao dung » cao dang, cao dong, cao ung
cong san » cong tac
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - thanh tung cao dung cong san ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - thanh tung cao dung cong san ((toan tai) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi chi sang - thanh tung cao dung cong san ((toan tai) or (toan ban))*.