Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
dong trong » duong trong, dung trong, cong trong
chinh cua » chinh ca, chinh sua, hinh cua
cua dong » chua dong, cua cong, cua dang
cac tai » cao tai, cac bai, cac dai
tai tap » bai tap, tai tao, hai tap

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 xanh) or (chieu xanh)) - hanh chinh cua dong trong cac tai tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - hanh chinh cua dong trong cac tai tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - hanh chinh cua dong trong cac tai tap*.