Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
chieu sang » chieu sach, chieu xanh, hieu lang
trinh chua » trinh cua, trinh chu, tinh chua
doi chieu » doc hieu, doi chi, ho chieu
dang cong » dung cong
cong san » cong tac
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - hanh ((trinh chua) or (trinh chuan)) dang cong san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh ((trinh chua) OR (trinh chuan)) dang cong san than cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((trinh chua) or (trinh chuan)) dang cong san than cao*.