Perhaps you should try some spelling variations:
chinh trong » chinh cong
dung phuong » dung thuong, bang phuong, dung chung
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
hinh trong » dinh trong, sinh trong, binh trong
quang dung » quang trung, ung dung, cuong dung
phuong dan » phuong danh, phuong doan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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)) - ((chinh trong) or (hinh trong)) quang dung phuong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - ((chinh trong) OR (hinh trong)) quang dung phuong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - ((chinh trong) or (hinh trong)) quang dung phuong dan chan cau*.