Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh
hoc thieu » toc thieu, hoc hien
van nhung » van nhuong, va nhung, van hung
cong sang » cong lang, cong vang, cong bang
cong san » cong tac
than cao » toan cao, thai cao, than cap

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 trinh) OR (hanh chinh)) van nhung ((cong sang) or (cong san)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh trinh) OR (hanh chinh)) van nhung ((cong sang) OR (cong san)) than cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((hanh trinh) OR (hanh chinh)) van nhung ((cong sang) or (cong san)) than cao*".