Perhaps you should try some spelling variations:
truong tuong » truong thuong, trong tuong, tuong tuong
hanh truong » hanh trong, anh truong, manh truong
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
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 chieu sang - hanh truong tuong duong ((cong dan) or (cong tac)) ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh truong tuong duong ((cong dan) OR (cong tac)) ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - hanh truong tuong duong ((cong dan) or (cong tac)) ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh truong tuong duong ((cong dan) or (cong tac)) ((toan cau) OR (toan cao))*.