Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
trong san » trong cac, cong san, dong san
doi hieu » doi chieu, doc hieu, doi hien
tung cao » nung cao, truong cao, trung cap
cao dung » cao dang, cao dong, cao ung
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban

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

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