Perhaps you should try some spelling variations:
thong thanh » phong thanh, thong than, trong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
trong danh » trong doanh, truong danh, trong anh
hoc chieu » hoc thieu, ho chieu, hoc hien
va thong » va thuong, va phuong, va cong
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 - canh trinh ((va thong) OR (he thong)) ((thong thanh) or (trong danh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - canh trinh ((va thong) OR (he thong)) ((thong thanh) OR (trong danh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - canh trinh ((va thong) OR (he thong)) ((thong thanh) or (trong danh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - canh trinh ((va thong) OR (he thong)) ((thong thanh) or (trong danh)) toan ban*.