Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
thong cong » trong cong, tong cong, thong thong
chinh vat » chinh va, chinh dat, chinh viet
vat thong » va thong, vat trong, mat thong
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

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