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