Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung tung » nhung tuong, nhung dung, nhung vung
trang cua » tranh cua, tang cua, trung cua
cua nhung » va nhung
tung dan » dung dan, huong dan, trung dai
toan cau » toan cao, toan tap, toan tai
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 ((thieu sang) or (chieu xanh)) - hanh trang cua nhung tung dan ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu xanh)) - hanh trang cua nhung tung dan ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu xanh)) - hanh trang cua nhung tung dan ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu xanh)) - hanh trang cua nhung tung dan ((toan cau) OR (toan ban))*.