Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
cua hang » cua nhung, cua cong, cua ban
cua dang » cua cong, cua ban
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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 - hanh tranh ((cua hang) OR (cua dang)) cong bai toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh tranh ((cua hang) OR (cua dang)) cong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh ((cua hang) OR (cua dang)) cong bai toan cao*.