Perhaps you should try some spelling variations:
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 manh » cong danh, duong manh, cong thanh
cua dong » chua dong, cua cong, cua dang
toan cao » toan tap
toan ban » van ban

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 ((su dung) or (cua dong)) cong manh ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh truong ((su dung) OR (cua dong)) cong manh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - hanh truong ((su dung) or (cua dong)) cong manh ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh truong ((su dung) or (cua dong)) cong manh ((toan cao) OR (toan ban))*.