Perhaps you should try some spelling variations:
trong dong » trong cong, trong nong, trong dang
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
chinh cua » chinh ca, chinh sua, hinh cua
cua trong » cua truong, cua trung, qua trong
von doanh » van doanh, voi doanh, toan doanh
von toan » van toan, mon toan, bong toan

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 (hieu lang)) - hanh chinh cua trong dong ((von toan) or (von doanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - hanh chinh cua trong dong ((von toan) OR (von doanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - hanh chinh cua trong dong ((von toan) or (von doanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - hanh chinh cua trong dong ((von toan) or (von doanh)) cau*.