Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trang va » tran van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
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: hoc thieu xanh - canh ((trang va) or (hang va)) nhung cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((trang va) OR (hang va)) nhung cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((trang va) or (hang va)) nhung cong dan than tap*.