Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thieu xanh » chieu xanh, hieu manh, thien danh
thien anh » thien danh, tien anh, thien thanh
tranh cua » doanh cua, manh cua
cua trung » cua truong, xuan trung, cua nhung
uong dan » huong dan, tuong dan, xuong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan 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 tranh cua trung uong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - hanh tranh cua trung uong dan than tap*.