Perhaps you should try some spelling variations:
trinh thanh » tinh thanh, trinh han, trinh toan
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hanh trinh » canh tranh
quang dang » quang dung, quang dong, quang hoang
dang cong » dung cong
thanh cac » hanh cac, thanh bac, thanh ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) OR (chieu sang)) - ((hanh trinh) or (hanh chinh)) quang dang cong trinh thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sang)) - ((hanh trinh) OR (hanh chinh)) quang dang cong trinh thanh cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sang)) - ((hanh trinh) or (hanh chinh)) quang dang cong trinh thanh cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sang)) - ((hanh trinh) or (hanh chinh)) quang dang cong trinh thanh cac*.