Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
cong tang » cong thang, cong lang, cong vang
trinh he » trinh han, trinh hoa, trinh thi
cong tan » cong tac, cong san, cong thanh
song van » hoang van, trong van, duong van
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: toc thieu xanh - hanh trinh he thong ((((cong tan) or (cong tang))) or (song van)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu xanh - hanh trinh he thong ((((cong tan) OR (cong tang))) OR (song van)) than tap.
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - hanh trinh he thong ((((cong tan) or (cong tang))) or (song van)) than tap*.