Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
trinh chua » trinh cua, trinh chu, tinh chua
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 xanh) OR (chieu sach)) - 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 xanh) OR (chieu sach)) - hanh ((trinh chua) OR (trinh chuan)) dang cong san than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) OR (chieu sach)) - hanh ((trinh chua) or (trinh chuan)) dang cong san than cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) OR (chieu sach)) - hanh ((trinh chua) or (trinh chuan)) dang cong san than cao*.