Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
thiet tach » chiet tach, thien hach, thuat tach
hanh trinh » canh tranh, hanh chinh
quang hung » quang dung, quang phuong, quang trung
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
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: hoc thiet tach - hanh trinh quang hung ((cong dan) or (cong san)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh trinh quang hung ((cong dan) OR (cong san)) ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh trinh quang hung ((cong dan) or (cong san)) ((toan cau) or (toan cao))*.