Perhaps you should try some spelling variations:
cong trong » cong thuong, duong trong, cong trinh
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
trong dan » trong dang, trong san, trong tan
tien anh » tieng anh, tien manh, dien anh
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 (tien anh)) - hanh tinh cua cong trong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (tien anh)) - hanh tinh cua cong trong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (tien anh)) - hanh tinh cua cong trong dan toan cao*.