Perhaps you should try some spelling variations:
cong tuong » cong thuong, cong truong, cong trong
thieu xanh » chieu xanh, hieu manh, thien danh
thien anh » thien danh, tien anh, thien thanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tuong dan » huong dan, tung dan, xuong dan
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan 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 (thien anh)) - hanh tinh cua cong tuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - hanh tinh cua cong tuong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - hanh tinh cua cong tuong dan toan cao*.