Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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) or (hanh trinh)) va dung ((cong van) OR (song van)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh tranh) OR (hanh trinh)) va dung ((cong van) OR (song van)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((hanh tranh) or (hanh trinh)) va dung ((cong van) OR (song van)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh tranh) or (hanh trinh)) va dung ((cong van) OR (song van)) toan cao*.