Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
va phuong » va thuong, cac phuong
va thong » va thuong, he thong, va cong
dan toan » van toan, dan than, manh toan
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 (thieu quang)) - hanh tranh ((va thong) or (va phuong)) huong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - hanh tranh ((va thong) OR (va phuong)) huong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - hanh tranh ((va thong) or (va phuong)) huong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - hanh tranh ((va thong) or (va phuong)) huong dan toan ban*.