Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
quang dung » quang trung, ung dung, cuong dung
dung huong » dung thuong, dung phuong, dong huong
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu xanh) OR (chieu tinh)) - hanh trinh quang dung huong dan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (chieu tinh)) - hanh trinh quang dung huong dan ((toan cau) OR (toan tap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu xanh) OR (chieu tinh)) - hanh trinh quang dung huong dan ((toan cau) or (toan tap))*".