Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
trinh chua » trinh cua, trinh chu, tinh chua
dong cong » duong cong, dung cong, dang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: ho ((chieu sang) or (chieu sach)) - hanh ((trinh chua) OR (trinh chuan)) dong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - hanh ((trinh chua) OR (trinh chuan)) dong cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chieu sach)) - hanh ((trinh chua) OR (trinh chuan)) dong cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - hanh ((trinh chua) OR (trinh chuan)) dong cong dan toan cao*.